text stringlengths 174 655k | id stringlengths 47 47 | score float64 2.52 5.25 | tokens int64 39 148k | format stringclasses 24
values | topic stringclasses 2
values | fr_ease float64 -483.68 157 | __index__ int64 0 1.48M |
|---|---|---|---|---|---|---|---|
Time and Frequency from A to Z: D to Do
A number or series of numbers used to identify a given day with the least possible ambiguity. The date is usually expressed as the month, day of month, and year. However, integer numbers such as the Julian Date are also used to express the date.
Daylight Saving Time
The part of t... | <urn:uuid:8885f164-65e1-4fdd-beef-17d693860475> | 3.484375 | 589 | Knowledge Article | Science & Tech. | 51.032085 | 300 |
NOAA: December Global Ocean Temperature Second Warmest on Record
For the year, 2009 Annual Temperature Tied for Fifth-Warmest
January 21, 2010
The global ocean surface temperature was the second warmest on record for December, according to scientists at NOAA’s National Climatic Data Center in Asheville, N.C. Based on r... | <urn:uuid:5d709afc-d370-4072-996f-c8a3234be552> | 2.9375 | 718 | News (Org.) | Science & Tech. | 57.596935 | 301 |
During the next two weeks, you can help build a map of global light pollution, assisting scientists and astronomers as they monitor the loss of virgin night skies. You just have to look at the stars and write down what you see — or, more likely, what you don’t see.
Imagine if every time you needed to officially identif... | <urn:uuid:500e5554-819d-4c21-8fac-36b69903181e> | 2.53125 | 177 | Content Listing | Science & Tech. | 48.038874 | 302 |
Evolution in the light of intelligent design - New entries
Appendix (human appendix) - despite it's name, no longer considered superfluous or rudimentary (Tyler)
Acritarchs - oldest known protists (Tyler)
The picture emerging of the Late Archaean is one that includes prokaryotes and eukaryotes, photosynthesis, an oxyge... | <urn:uuid:dbdde9c1-8368-4111-879a-4dad9d61cd92> | 3.09375 | 771 | Content Listing | Science & Tech. | 16.36004 | 303 |
The first thing to note about the psqlODBC driver (or any ODBC driver) is that there must exist a driver manager on the system where the ODBC driver is to be used. There exists a free ODBC driver for Unix called iODBC which can be obtained via http://www.iodbc.org. Instructions for installing iODBC are contained in the... | <urn:uuid:12956776-ea5d-4ea0-9486-c9781f2e6021> | 2.625 | 445 | Tutorial | Software Dev. | 52.14017 | 304 |
Pascal is an influential imperative and procedural programming language, intended to encourage good programming practices using so called structured programming and data structuring.
: What is the reason for this problem? If I leave pascal doing anything
: in loop, After ~30 secs loop is runiing slower than before, but... | <urn:uuid:12c439b2-de89-49db-af74-dbe35321f621> | 2.8125 | 280 | Comment Section | Software Dev. | 66.903623 | 305 |
Hansen is threatening humanity again with climate dice
Perceptions of Climate Change: The New Climate Dice
We conclude that extreme heat waves, such as that in Texas and Oklahoma in 2011 and Moscow in 2010, were “caused” by global warming
Hansen has been holding the dice since he had a full head of hair, and has been c... | <urn:uuid:757fd6f8-d93e-4ecd-adb0-aec36d25ca61> | 2.59375 | 101 | Personal Blog | Science & Tech. | 50.753333 | 306 |
Antimatter came about as a solution to the fact that the equation describing a free particle in motion (the relativistic relation between energy, momentum and mass) has not only positive energy solutions, but negative ones as well! If this were true, nothing would stop a particle from falling down to infinite negative ... | <urn:uuid:0ee63bec-49ee-4e62-a8f7-6b79d5db4f5b> | 3.6875 | 717 | Knowledge Article | Science & Tech. | 26.957256 | 307 |
Exceptional Beginner Chemistry Set
Can you make dazzling colors in flame tests? Create your own mini fire extinguisher? With these hands-on lab sets, you will perform highly rewarding experiments while building a strong foundation in chemistry. The 80-page, full-color experiment manual guides aspiring young chemists th... | <urn:uuid:3516df27-bfe4-43db-8b1d-95372d9e7b16> | 3.328125 | 519 | Product Page | Science & Tech. | 24.123062 | 308 |
Posted Sunday, Feb. 24, 2013, at 8:00 AM
Years ago, in 1999, some odd pictures were returned from The Mars Global Surveyor space probe orbiting the red planet. They showed what looked for all the world(s) like trees, banyan trees, dotting the Martian landscape. They made quite a splash on the internet, and you can see ... | <urn:uuid:641c25c1-c61b-496d-816a-517009d91725> | 4.0625 | 878 | Personal Blog | Science & Tech. | 59.815987 | 309 |
Hyenas cooperate, problem-solve better than primates
(NC&T/DU) Captive pairs of spotted hyenas (Crocuta crocuta) that needed to tug two ropes in unison to earn a food reward cooperated successfully and learned the maneuvers quickly with no training. Experienced hyenas even helped inexperienced partners do the trick.
Wh... | <urn:uuid:7193b74f-6980-4546-a411-41c2c10c22a3> | 3.265625 | 979 | News Article | Science & Tech. | 35.190647 | 310 |
Researchers with the U.S. Geological Survey and the U.S. Fish and Wildlife Service have used unmanned aircraft in three trials to count the number of sandhill cranes that visit the Monte Vista National Wildlife Refuge and found them to be a safe alternative for both birds and scientists.
“What these systems do is they ... | <urn:uuid:db0ef56e-a149-4e12-a6c4-fcf4b5eb36e8> | 3.453125 | 553 | News Article | Science & Tech. | 53.074896 | 311 |
Elemental analysis is a process where a sample of some material (e.g., soil, waste or drinking water, bodily fluids, minerals, chemical compounds) is analyzed for its elemental and sometimes isotopic composition. Elemental analysis can be qualitative (determining what elements are present), and it can be quantitative (... | <urn:uuid:df340b51-ca16-473c-9b5f-8b1e02d00178> | 3.625 | 472 | Knowledge Article | Science & Tech. | 6.327784 | 312 |
ExploraTour - How to Build a Star
"But wait a minute," you say. "We've tried this nuclear fusion stuff on Earth to produce energy and so far it hasn't worked very well. How does the sun succeed where we have failed?"
You are right. Operational nuclear power plants on Earth use fission reactions to produce power. They w... | <urn:uuid:774cbc1e-d50b-432b-9ca1-4a27d0d9fdf4> | 4.0625 | 209 | Knowledge Article | Science & Tech. | 54.718394 | 313 |
If you read this blog regularly, you know I have a fondness for the so-called “missing eruptions” — that is, volcanic events found in ice core or sediment records but not yet identified in the geologic/volcanic record. The most glaring right now is the eruption of 1258 A.D., supposedly 1.8 times as large as the 1815 er... | <urn:uuid:eecc926a-6ecd-4a92-bf87-2115959015a7> | 3.140625 | 239 | Personal Blog | Science & Tech. | 41.674462 | 314 |
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
October 24, 1998
Explanation: Sunrise seen from low Earth orbit by the shuttle astronauts can be very dramatic indeed ( and the authors apologize to... | <urn:uuid:c9075ef6-33ed-4b24-8c3e-133f541a5196> | 3.171875 | 192 | Knowledge Article | Science & Tech. | 43.921905 | 315 |
Diversity-biological as well as social, linguistic and cultural diversity-is the lifeblood of sustainable development and human welfare. It is key to resilience-the ability of natural and social systems to adapt to change and is essential for nearly every aspect of our lives.
That’s why, in the run-up to the IUCN World... | <urn:uuid:48b8e187-61e6-4b50-beb6-a8821c058d10> | 2.859375 | 190 | Knowledge Article | Science & Tech. | 18.728694 | 316 |
I believe that, from the perspective of the C++ Standard, there is no difference between #include "xyz.h" and #include "xyz.cpp" if they both contain the same thing. In practice, an IDE might create the makefile (or other build script) such that "xyz.cpp" is compiled even when it should not be, possibly leading to rede... | <urn:uuid:2f3a7e6a-1591-4c19-b893-45b791782dd2> | 2.75 | 619 | Comment Section | Software Dev. | 53.381491 | 317 |
|Name, Symbol, Number|| krypton, Kr, 36
|Chemical series||noble gases|
|Group, Period, Block||18, 4, p|
|Appearance|| colorless |
|Atomic mass||83.798(2) g/mol|
|Electron configuration||[Ar] 3d10 4s2 4p6|
|Electrons per shell||2, 8, 18, 8|
|Density|| (0 °C, 101.325 kPa)|
|Melting point|| 115.79 K|
(-157.36 °C, -251.25 ... | <urn:uuid:dd2b7efe-0dbd-42a5-b50d-781bb9434163> | 3.28125 | 1,260 | Knowledge Article | Science & Tech. | 60.270636 | 318 |
You should always externalize resources such as images and strings from your application
code, so that you can maintain them independently. Externalizing your
resources also allows you to provide alternative resources that support specific device
configurations such as different languages or screen sizes, which becomes... | <urn:uuid:393c5454-aa47-4d5a-9009-34999bb3ff39> | 3.171875 | 498 | Documentation | Software Dev. | 6.87839 | 319 |
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: The Permo-Triassic extinction killed the dinosaurs, according to Fox News
What an excellent example of sloppy journalism. The sad thing is that the paper
could have made a very interesting news story in the right... | <urn:uuid:4c38a9aa-d0c0-4113-a0cc-88674c6dd2b9> | 2.609375 | 718 | Comment Section | Science & Tech. | 55.808237 | 320 |
Economic growth in China has led to significant increases in fossil fuel consumption © stock.xchng (frédéric dupont, patator)
Per capita CO2 emissions in China reach EU levels
Global emissions of carbon dioxide (CO2) – the main cause of global warming – increased by 3% last year. In China, the world’s most populous cou... | <urn:uuid:5dbd7929-f5e4-4e00-8ee1-ac82d4729d56> | 3.03125 | 398 | Knowledge Article | Science & Tech. | 42.668752 | 321 |
Plants have evolved a number of cold-response genes encoding proteins that induce tolerance to freezing, alter water absorption and initiate many other low temperature induced processes. In the 1 April Genes and Development, Jian-Kang Zhu and colleagues of the Department of Plant Sciences, University of Arizona, shed l... | <urn:uuid:3649223e-8026-4378-8234-d8647036ba6d> | 2.984375 | 297 | Academic Writing | Science & Tech. | 27.405926 | 322 |
- If the Earth rotated in the opposite sense (clockwise rather than counterclockwise), how long would the solar day be?
- Suppose that the Earth’s pole was perpendicular to its orbit. How would the azimuth of sunrise vary throughout the year? How would the length of day and night vary throughout the year at the equator... | <urn:uuid:dbe88d6f-99d3-40e4-ae1c-e659a8cace09> | 3.625 | 1,143 | Content Listing | Science & Tech. | 56.8545 | 323 |
|ROSAT Home Page||ROSAT
The time variability of X-ray emission can be studied with the HRI since each detected photon has its time of arrival recorded by the detector. The accuracy of this time is limited by the electronic resolution of the HRI processor which is 61 sec relative to the ROSAT spacecraft clock. The relat... | <urn:uuid:32e7c4e9-4f66-4a50-825f-0e4d7779c26b> | 2.5625 | 403 | Knowledge Article | Science & Tech. | 57.032754 | 324 |
New research shows that dolphins can stay awake for at least 15 days in a row without experiencing fatigue, or other negative side effects.
To put this in perspective, human research subjects have been able to stay awake for only eight to 10 days, and all experienced progressive deterioration in concentration, motivati... | <urn:uuid:a0f556e0-26a3-4dcc-a0ed-23efa46bb223> | 3.78125 | 320 | News Article | Science & Tech. | 26.925051 | 325 |
Search Loci: Convergence:
The Reader may here observe the Force of Numbers, which can be successfully applied, even to those things, which one would imagine are subject to no Rules. There are very few things which we know, which are not capable of being reduc'd to a Mathematical Reasoning; and when they cannot it's a s... | <urn:uuid:1133c1bd-455a-4f42-be03-ecffa85e1482> | 2.75 | 763 | Academic Writing | Science & Tech. | 34.359673 | 326 |
Unitary Method Problem
Date: 02/01/99 at 19:13:36 From: Tamara Subject: A Unitary Method Problem Runts come in a carton. There are 8 packages in one carton. There are 3 boxes in each package. If there are 170 runts in one box, how many runts are there in 6 cartons?
Date: 03/01/99 at 17:48:36 From: Doctor Swiss Subject:... | <urn:uuid:62fdfc79-523b-416e-907b-66a7613df15b> | 2.65625 | 514 | Q&A Forum | Science & Tech. | 84.993487 | 327 |
A few months ago I read about a very simple but fun probability puzzle. Someone tells you:Try to solve it yourself. John Baez mentions that you would think or he would think that the information about Tuesday is irrelevant because the days of the week are independent of the sex and we only care about the latter.
“I hav... | <urn:uuid:f41a2762-3903-4c42-a292-d7c0d70bff3d> | 2.578125 | 1,661 | Comment Section | Science & Tech. | 59.928435 | 328 |
By Mark Kinver
Science and environment reporter, BBC News
The populations of the world's common birds are declining as a result of continued habitat loss, a global assessment has warned.
The survey by BirdLife International found that 45% of Europe's common birds had seen numbers fall, as had more than 80% of Australia... | <urn:uuid:73f989c0-8fdf-4b9b-88c7-3308c8965da8> | 3.125 | 1,136 | News Article | Science & Tech. | 42.722433 | 329 |
Despite their collective efficiency and order, beehives are often plagued by scourges that would rival a medieval city. Varroa mites, deformed wing virus, and intestinal fungi are just a few of the worst. Now researchers have identified a new enemy that ought to strike fear in the hearts of honey bees: A tiny fly that ... | <urn:uuid:b3b1b38c-5c83-4b55-ba48-24971aa87ed5> | 3.234375 | 906 | News Article | Science & Tech. | 47.171763 | 330 |
Will The Earth Stop Rotating?
Date: 1999 - 2000
Will the earth stop rotating?
Yes, but not for a long long long time. (If I remember correctly, it is
currently slowing down by about half a second per century.) As the
earth rotates it gets stretched and squeezed by tidal forces. The
energy required to do this work comes... | <urn:uuid:04155edf-d0d0-4ea6-b914-a10ba3c95a22> | 3.15625 | 476 | Knowledge Article | Science & Tech. | 74.65 | 331 |
Using OpenMP - The Book and Examples
Use this forum to discuss the book: Using OpenMP- Portable Shared Memory Parallel Programming
by Barbara Chapman, Gabriele Jost and Ruud van der Pashttp://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=11387
The sources are available as a free download under the BSD license. ... | <urn:uuid:cdc62d61-188b-4a3a-9317-ec4f7188eca6> | 2.890625 | 312 | Comment Section | Software Dev. | 45.194425 | 332 |
An Analysis of the Classic Arctic Outbreak Event of Late December 2008-Early January 2009
By Christian M. Cassell
Stratospheric Role |
The 2008-2009 winter was characterized by colder than normal temperatures and above normal snowfall for each month from October through March. While there was no one significant snow ev... | <urn:uuid:9aae393d-86f4-4331-b269-7344c5e77b24> | 2.78125 | 406 | Truncated | Science & Tech. | 38.90308 | 333 |
Closing in on the Planck constant
Sep 25, 1998
Physicists in the US have made the most accurate measurements ever of the Planck constant, h. Edwin Williams and colleagues at the National Institute of Standards and Technology in Gaithersburg, Maryland, measured h by comparing the voltage needed to control the velocity o... | <urn:uuid:cd89c0d8-ef60-4435-b4e8-e79d00dd783c> | 3.84375 | 420 | News Article | Science & Tech. | 57.31381 | 334 |
Ultrafast electron microscope makes movies
Dec 8, 2006
Physicists have created a new form of electron microscopy that can make "movies" of atoms as they undergo ultra-rapid chemical or structural transitions. Ahmed Zewail and colleagues at the California Institute of Technology in the US have used coincident electron a... | <urn:uuid:2f1970f4-49fa-40b8-b5c8-2587723cbf65> | 3.625 | 638 | News Article | Science & Tech. | 28.197514 | 335 |
The coral is at the mercy of natural circumstances like water quality and starfish population, but can be aided by human intervention. The first step to take will be decreasing population and CO2 emissions.
Coral cover in the Great Barrier Reef has dropped by more than half over the last 27 years, according to scientis... | <urn:uuid:abe92949-5b38-4785-8ba0-6474ec1a9938> | 3.90625 | 1,145 | News Article | Science & Tech. | 45.925316 | 336 |
Free Search (1444 videos)
IML-1: International Microgravity Laboratory
- Title IML-1: International Microgravity Laboratory
- Released 01/01/1992
- Length 00:16:05
- Language English
- Footage Type Documentary
A 16:07 minute description of Space Lab, the world's first reusable space laboratory built in Europe and launc... | <urn:uuid:d5ac6cf9-7c7b-4cd5-b879-aede3d52f6c2> | 2.53125 | 174 | Truncated | Science & Tech. | -0.670341 | 337 |
Part of twisted.python View Source
These are methods which you can register pre-call and post-call external functions to augment their functionality. People familiar with more esoteric languages may think of these as "method combinations".
This could be used to add optional preconditions, user-extensible callbacks (a-l... | <urn:uuid:baa0a3d3-1319-453e-8d47-16c383b535f2> | 2.6875 | 613 | Documentation | Software Dev. | 45.147802 | 338 |
posted last year in Dev Platform category by Dongsun Choi
There are various techniques to improve the performance of your Java application. In this article I will talk about Statement Pooling Configuration and its effect on Garbage Collection process.
Statement Pooling allows to improve the performance of an applicatio... | <urn:uuid:58e286fd-915a-44e4-a97d-e39ff2786f38> | 2.515625 | 1,492 | Documentation | Software Dev. | 47.591944 | 339 |
Science subject and location tags
Articles, documents and multimedia from ABC Science
Monday, 18 February 2013
Heavy metal music fans in a mosh pit act like atoms in a gas - a finding that could advance emergency evacuation design and planning.
Wednesday, 21 September 2011
An Australian seismologist says this week's tr... | <urn:uuid:3ab4852f-3f65-46af-a429-f89b21ced198> | 2.703125 | 305 | Content Listing | Science & Tech. | 29.245053 | 340 |
Climate Change May Lead to Fewer -- But More Violent -- Thunderstorms Tuesday, July 10, 2012
Number of flash floods and forest fires could increase with temperature, says TAU researcher
Researchers are working to identify exactly how a changing climate will impact specific elements of weather, such as clouds, rainfall,... | <urn:uuid:b7e1cd3d-cfd1-4c46-9cf1-aa54d40e8c89> | 3.3125 | 751 | News (Org.) | Science & Tech. | 31.281752 | 341 |
News - Ocean Observations
Photo credit: Peter Rejcek
Posted: July 7, 2010
Courtesy: Antarctic Sun
By Peter Rejcek
Underwater robots and marine animals outfitted with scientific sensors are part of a proposed strategy for monitoring polar oceans into the 21st century, particularly a stretch of sea along the western Anta... | <urn:uuid:5d47cba1-4b20-45d1-ab44-d623e4d5f02d> | 2.90625 | 681 | News Article | Science & Tech. | 29.755172 | 342 |
Solar storms active, but normal
Illustration showing blasts of particles and magnetic field from the Sun that impact the magnetosphere, the magnetic bubble around the Earth (courtesy NASA).
Outbursts observed on the sun last week do not portend new problems for GPS reception or other systems as solar flares and eruptiv... | <urn:uuid:a44388a2-6fcf-47b4-937d-fc996ba7b47c> | 3.15625 | 753 | News Article | Science & Tech. | 47.963629 | 343 |
They are both nest-building social insects, but paper wasps and honey bees organize their colonies in very different ways. In a new study, researchers report that despite their differences, these insects rely on the same network of genes to guide their social behavior.
The study appears in the Proceedings of the Royal ... | <urn:uuid:c515e6d2-19b4-4614-92dc-90e2a7529cd6> | 3.65625 | 698 | News Article | Science & Tech. | 34.793888 | 344 |
Observations on zugunruhe in spring migrating Eared Grebes.
|Abstract:||About 200 North American Eared Grebes (Podiceps nigricollis californicus) at Tule Lake Refuge in northern California were observed engaging in successive waves of mass pattering and pattering flights on 25 May 2011. Most grebes present in a part of... | <urn:uuid:2aeeaf9e-3230-4652-98f2-c49e22d6bc2b> | 3.15625 | 3,989 | Academic Writing | Science & Tech. | 55.555742 | 345 |
stressArticle Free Pass
stress, in physical sciences and engineering, force per unit area within materials that arises from externally applied forces, uneven heating, or permanent deformation and that permits an accurate description and prediction of elastic, plastic, and fluid behaviour. A stress is expressed as a quo... | <urn:uuid:79e0dfc6-44f0-433d-bdf7-1f27c991027e> | 4.21875 | 547 | Knowledge Article | Science & Tech. | 46.057482 | 346 |
evidence suggests that life originated in extreme environments,
for example, at high temperatures. The National Science
Foundation (NSF) has initiated a program called Life in
the Extreme Environment (LExEn) that is dedicated to finding
new and exciting organisms that live in harsh environments.
The Extreme 2000 resear... | <urn:uuid:34eb878c-35eb-443f-b0b8-8f0942552023> | 3.984375 | 546 | Knowledge Article | Science & Tech. | 35.707536 | 347 |
The success of a concurrent system depends on well designed hardware, flexible software that controls the hardware, and clear marketing vision. To adapt the changing marketing requirement, hardware and software need to have flexible architectures. This article is focused on software development issues, and discusses co... | <urn:uuid:e284b760-a01f-49e4-8cf1-71388aedbea7> | 3.21875 | 4,871 | Academic Writing | Software Dev. | 45.019693 | 348 |
COLUMBUS, Ohio (AP) -- A group of international algae experts say there are no quick or easy solutions to clear algae from Lake Erie and Grand Lake St. Marys in Ohio.
In the case of Grand Lake St. Marys, it could even take decades.
The Columbus Dispatch (http://bit.ly/WtnmLC ) reports that experts spoke about the algae... | <urn:uuid:cd0c7a86-fae8-4a5b-8b0e-892849c5c38c> | 2.53125 | 182 | Truncated | Science & Tech. | 60.98378 | 349 |
Modern programming languages have little support for writing secure software,
making it all too easy to write programs with exploitable vulnerabilities.
In these lectures, we explore a general technique based on type qualifiers
that allows programmers to write down, in their souce code, their intentions
with respect to... | <urn:uuid:c22fb70a-8efe-41d8-8a5e-de429096e99f> | 2.625 | 396 | Content Listing | Software Dev. | 5.734788 | 350 |
A study led by researchers at the University of Colorado has determined that the pace of planet warming in the first decade of this century was slowed by volcanic activity, and not by industrial activity in Asia, as was previously believed.
Previous research in 2009 had suggested that an increase in stratospheric aeros... | <urn:uuid:8694d936-0085-4edd-a6e6-c8493988c285> | 3.328125 | 784 | News Article | Science & Tech. | 33.929922 | 351 |
Unprecedented sea-level rise over 20th century pins down future of rising oceans
Sea-level rises from global warming remain one of the big unknowns in the jostling crowd of climate threats. We know that warming water expands - and so coastal communities will be threatened, as the sea swells in response to rising temper... | <urn:uuid:66c1334a-f2a1-4bea-a6b3-481e80977839> | 3.78125 | 756 | Truncated | Science & Tech. | 48.226896 | 352 |
We consider a simple pure substance under hydrostatic conditions
described by the following fundamental equation:
where the extensive variables U, V and N are the internal energy, the volume, and the number of particles respectively, and the intensive variables T, p and are the temperature, the pressure and the chemica... | <urn:uuid:f64a9fe0-fb27-407b-891a-d7ab31581e3a> | 2.78125 | 451 | Academic Writing | Science & Tech. | 23.064551 | 353 |
Apr 4, 2012 / ENERGY GLOBE Award
Project presentation - "One Child - One Solarlight"
Electricity is a scarce commodity in Africa. The whole continent spends not more electricity than New York. At night the villages are dark. The only source of light for many children – while they do their homework – is kerosene light, ... | <urn:uuid:6f850524-efdf-4980-8376-340a7f059486> | 2.90625 | 264 | News (Org.) | Science & Tech. | 50.322626 | 354 |
At various points along the path toward productive nanosystems for molecular manufacturing it would be useful to be able to calculate the properties and reactions of assemblies of atoms of various sizes. Within the domain of non-relativistic quantum mechanics, such information is supplied by the Schrödinger equation, b... | <urn:uuid:73d1cea5-f27a-4547-a5b0-80544b2bc1bf> | 3.453125 | 583 | Nonfiction Writing | Science & Tech. | 17.564268 | 355 |
Electricity and magnetism
The dot product Introduction to the vector dot product.
The dot product
⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles.
- Let's learn a little bit about the dot product.
- Th... | <urn:uuid:897a62d5-1a0a-42ef-a9ef-517a73b9b936> | 4.53125 | 2,885 | Truncated | Science & Tech. | 74.68687 | 356 |
Hacking Quantum Cryptography Just Got Harder
With quantum encryption, in which a message gets encoded in bits represented by particles in different states, a secret message can remain secure even if the system is compromised by a malicious hacker.
CREDIT: margita | Shutterstock
VANCOUVER, British Columbia — No matter h... | <urn:uuid:d0f6c11e-5d9a-4eac-8057-aad25b3d2613> | 3.390625 | 946 | News Article | Science & Tech. | 44.867095 | 357 |
Zoologger is our weekly column highlighting extraordinary animals – and occasionally other organisms – from around the world
Step from a sunlit hillside into the darkness of a cave, and you immediately have a problem: you can't see. It's best to stand still for a few minutes until your eyes adjust to the dimness, other... | <urn:uuid:af338612-8df7-49f3-953a-3be7407dfe41> | 3.390625 | 1,252 | Truncated | Science & Tech. | 53.685916 | 358 |
- 1 hammer
- something hard and resonant (and inanimate) to bang it on
- 1 clock with a second hand
- 1 measuring tape
- 1 helper
- 1 pair of binoculars
Sound travels at 344 metres per second in air at 20 °C. This is slow enough for noises to be noticeably delayed when heard from even quite a short distance. You can us... | <urn:uuid:b9c9157d-c12e-4d9b-b2f0-ad73f0197497> | 3.703125 | 218 | Truncated | Science & Tech. | 64.579538 | 359 |
|National Weather Service|
Contents: About, Graph, Status Maps, History Button, Credits
To use this website, click on the appropriate REGION. This will update the list of STATIONS and show a "Status Map" for that region. Click on your desired station, either on the map or in the list of STATIONS. This will bring up a g... | <urn:uuid:2ef9c003-396e-4752-b9a6-dcc3dae7c434> | 3.171875 | 985 | Documentation | Science & Tech. | 64.47905 | 360 |
The associative array -- an indispensable data type used to describe a collection of unique keys and associated values -- is a mainstay of all programming languages, PHP included. In fact, associative arrays are so central to the task of Web development that PHP supports dozens of functions and other features capable o... | <urn:uuid:8d9d41d5-5f23-454d-95a8-8abc57ab3eae> | 3.046875 | 722 | Tutorial | Software Dev. | 24.560172 | 361 |
Researchers at UCLA have built a cheap, optics-free holographic microscope capable of detecting bacteria like E. coli in things like water, food, and blood. And by cheap, we mean really cheap. The researchers say it costs less than $100 to build.
The microscope has two ways of analyzing samples: a transmission mode and... | <urn:uuid:bbb7aa65-c191-461e-a3b7-5d90d73beae4> | 3.125 | 413 | News Article | Science & Tech. | 44.394353 | 362 |
CSIRO Marine and Atmospheric Research, Barrie Hunt, says 'Despite 2010 being a very warm year globally, the severity of the 2009-2010 northern winter and a wetter and cooler Australia in 2010 relative to the past few years have been misinterpreted by some to imply that climate change is not occurring.'
'Recent wet cond... | <urn:uuid:df0d3c64-9bd5-4d02-98f8-7a7c217e5a58> | 3.40625 | 601 | Knowledge Article | Science & Tech. | 26.796172 | 363 |
June 14, 2007 At one time Cyclone Gonu was a powerful Category 5 storm packing sustained winds of 160 mph (139 knots), according to the Joint Typhoon Warning Center, making it the most powerful cyclone ever to threaten the Arabian Peninsula since record keeping began back in 1945. Fortunately the storm weakened signifi... | <urn:uuid:304f6c93-31f0-49d8-9017-4c0c2dd36ed6> | 3.140625 | 806 | News Article | Science & Tech. | 51.248756 | 364 |
The chemical traces of water have been found in this moon rock, called the Genesis Rock. The moon rock was collected by astronauts during the Apollo 15 mission in 1971 and is thought to be a piece of the moon's primordial crust. Image: NASA/Johnson Space Center
The discovery of "significant amounts" of water in moon ro... | <urn:uuid:6f64d0fb-6a9f-4041-a215-454df9c1625b> | 3.84375 | 762 | News Article | Science & Tech. | 45.452112 | 365 |
The magnitude system works quite well for quantifying the brightness of stars. We know that a 6th magnitude star will be barely visible to the unaided eye from rural areas, yet easily seen in even the smallest of telescopes.
The magnitude system doesn’t work as well for deep-sky objects. Consider the spiral galaxy M33 ... | <urn:uuid:a964755c-840c-4fb5-bf10-6a64094c1257> | 3.71875 | 470 | Knowledge Article | Science & Tech. | 60.508222 | 366 |
It came closer ... closer ... and then it started heading away. But you may not have noticed at all.
An asteroid passed relatively close to Earth around 2:24 p.m. ET Friday. As scientists had been predicting all week, it did not hit.
A different and unrelated small asteroid entered the atmosphere over Russia on Friday,... | <urn:uuid:6b71fad7-574b-4701-a7ca-2b35c09beeb0> | 3.4375 | 356 | News Article | Science & Tech. | 61.130968 | 367 |
A new world record wind gust: 253 mph in Australia's Tropical Cyclone Olivia
The 6,288-foot peak of New Hampshire's Mount Washington is a forbidding landscape of wind-swept barren rock, home to some of planet Earth's fiercest winds. As a 5-year old boy, I remember being blown over by a terrific gust of wind on the summ... | <urn:uuid:3cf8391c-7628-4b73-b23d-af8d16292401> | 2.984375 | 1,482 | Personal Blog | Science & Tech. | 62.804295 | 368 |
Microformats in Context
There has been a lot of discussion in XML circles as to how far the extensibility revolution promised by XML can take (or has taken) us. Is XML really a tool for creating specialized languages so that information can be expressed in the most natural formats practical? Or is it just a way to redu... | <urn:uuid:de843d34-aa1b-47ea-b9be-46a6fab4ff18> | 2.5625 | 1,380 | Personal Blog | Software Dev. | 52.931013 | 369 |
Note the cold spots are not along the geographic line from the N. Pole to the S. Pole but where the globe, tilted and tipped, is getting the least amount of sunshine! Depending on the tipping and what part of the globe is getting sunlight, the coldest spot is not the geographic N. Pole, but that part of the globe that ... | <urn:uuid:c22f6858-5b30-4acd-b9da-15d49797c5ba> | 2.8125 | 627 | Comment Section | Science & Tech. | 86.902402 | 370 |
Bob Henson | July 2, 2012 • With a ferocity to match the record heat it displaced, a thunderstorm complex raced from Illinois to the Delaware coast in a mere 12 hours on Friday evening, June 29. It knocked down countless trees and power lines, with wind gusts topping 80 miles per hour in many spots. It threw millions o... | <urn:uuid:72904d0e-c03d-4a42-8d98-faa5ff0c59a1> | 2.9375 | 1,769 | Nonfiction Writing | Science & Tech. | 53.439911 | 371 |
A History of Innovation, a Path to the Future
March 1994 Visual C++ Strategy
The Microsoft Visual C++ development system family of products meets the need of developers to develop sophisticated Windows-based applications quickly. It also protects existing investments in the Microsoft Foundation Class Library (MFC) and ... | <urn:uuid:0dbf9581-7577-4b95-8e5b-255701854a09> | 2.75 | 4,989 | Knowledge Article | Software Dev. | 42.782835 | 372 |
July 18, 2012
Since the Industrial Revolution, ocean acidity has risen by 30 percent as a direct result of fossil-fuel burning and deforestation. And within the last 50 years, human industry has caused the world’s oceans to experience a sharp increase in acidity that rivals levels seen when ancient carbon cycles trigge... | <urn:uuid:d5fc8f97-1ffe-4404-b9ee-d359c5162435> | 3.796875 | 860 | Truncated | Science & Tech. | 20.203028 | 373 |
Tornadoes and Climate Change: Huge Stakes, Huge Unknowns
Posted: 12:05 PM EDT on May 23, 2013
We currently do not know how tornadoes and severe thunderstorms may be changing due to climate change, nor is there hope that we will be able to do so in the foreseeable future. It does not appear that there has been an increa... | <urn:uuid:e7908a91-7b74-42c2-ab95-59e1ffdccb6a> | 3.015625 | 204 | Content Listing | Science & Tech. | 64.028462 | 374 |
Exceptions are a means of breaking out of the normal flow of control
of a code block in order to handle errors or other exceptional
conditions. An exception is
The Python interpreter raises an exception when it detects a run-time error (such as division by zero). A Python program can also explicitly raise an exception ... | <urn:uuid:369dd57f-25d9-44e6-832c-29ed8d0645d2> | 4.09375 | 331 | Documentation | Software Dev. | 47.998813 | 375 |
Reading this tutorial has probably reinforced your interest in using Python -- you should be eager to apply Python to solve your real-world problems. Now what should you do?
You should read, or at least page through, the Python Library Reference, which gives complete (though terse) reference material about types, funct... | <urn:uuid:38f062ba-9102-4f56-a7fd-1c3d0fed3eab> | 2.65625 | 451 | Customer Support | Software Dev. | 49.919888 | 376 |
The thick durable sea ice that routinely cloaked much of the Arctic Ocean in colder decades in the 20th century is increasingly relegated to a few clotted places along northern Canada and Greenland, according to the latest satellite analysis of the warming region.
The following video gives you a fascinating view of one... | <urn:uuid:4e953074-259f-4363-a1d9-ec3bbe891cc4> | 3.359375 | 465 | News Article | Science & Tech. | 27.597235 | 377 |
||This article needs additional citations for verification. (March 2011)|
Nuclear meltdown is an informal term for a severe nuclear reactor accident that results in core damage from overheating. The term is not officially defined by the International Atomic Energy Agency or by the U.S. Nuclear Regulatory Commission. Ho... | <urn:uuid:593ff668-f2a3-43a3-a234-69537b1789d6> | 4.1875 | 11,510 | Knowledge Article | Science & Tech. | 41.095975 | 378 |
July 24, 2011
The photo above shows a lovely group of mushrooms nestled against the trunk of a eucalyptus tree. The association between the fungi and the tree however is no accident. This is a mutualistic relationship, where the two species assist each other, and in fact probably would be poorer without each other. Mut... | <urn:uuid:8821cc54-1a17-46f7-9c23-b857acf0dd8d> | 3.40625 | 492 | Personal Blog | Science & Tech. | 43.200575 | 379 |
A. There is an instant at which the string is completely straight.
B. When the two pulses interfere, the energy of the pulses is momentarily zero.
C. There is a point on the string that does not move up or down.
D. There are several points on the string that do not move up or down.
E. A and C are both true.
F. B and D ... | <urn:uuid:abc13551-d525-435b-9b24-7edce26b05a0> | 2.890625 | 88 | Q&A Forum | Science & Tech. | 93.35131 | 380 |
A Java Runtime Environment (JRE), version greater than 1.6, is required to run Jython and GeoScript. Chances are your system already has a JRE installed on it. A quick way to test is to execute the following from the command line:
% java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b... | <urn:uuid:ed373a01-f120-466b-bb33-95b45314fad3> | 2.5625 | 482 | Tutorial | Software Dev. | 74.319605 | 381 |
Hot Weather Gets Scientists' Attention
Originally published on Wed July 11, 2012 5:30 am
RENEE MONTAGNE, HOST:
Across America people are sweltering through extreme heat this year, continuing a long-term trend of rising temperatures. Inevitably, many are wondering if the scorching heat is due to global warming. Scientis... | <urn:uuid:e8e46237-1e26-4326-b62c-a25477bd0d59> | 3.15625 | 822 | Truncated | Science & Tech. | 53.82621 | 382 |
kottke.org posts about pimovie
Pi, God, and apartment supercomputers Jul 18 2005
The New Yorker recently ran a feature on how a couple of mathematicians helped The Met photograph a part of The Hunt of the Unicorn tapestries. That same week, they ran from their extensive archives a 1992 profile of the same mathematician... | <urn:uuid:d34fa334-0767-4289-b1bc-0392e180cdaf> | 2.609375 | 425 | Personal Blog | Science & Tech. | 43.302 | 383 |
[Tutor] adding together strings
Fri, 7 Apr 2000 08:02:02 -0700
> Hello python tutors,
> I hope you can help me with a little problem. (I am a beginner).
> I am working on a program which will access some files in a folder on the
> desktop without me having to type in the whole address every time.
> Here is what I would... | <urn:uuid:6b44b8a1-5afb-4888-b8f0-8c82c30d88d9> | 2.546875 | 409 | Comment Section | Software Dev. | 57.046184 | 384 |
Visualizing 1 + 1/x
Date: 10/10/2003 at 21:25:38 From: Mary Subject: logic How can I show that the sum of a positive number and its reciprocal is at least two?
Date: 10/11/2003 at 06:06:27 From: Doctor Luis Subject: Re: logic Hi Mary, Adding a positive number x > 0 and its reciprocal 1/x gives you the function f(x) = x... | <urn:uuid:46a4f20a-ca55-4a81-bcfd-57c978a4eebf> | 3.234375 | 482 | Comment Section | Science & Tech. | 99.736441 | 385 |
Work continues on readying Curiosity for surface operations on Mars, with characterisation phase well underway.
The week has seen the rover’s Chemistry and Camera system – ChemCam – undergoing its calibration tests using a target system located towards the back of the rover, while scientists have been looking for candi... | <urn:uuid:e6bb1611-4ea3-4b5b-ad3d-ecba04ea69a8> | 3.46875 | 597 | News Article | Science & Tech. | 41.673831 | 386 |
Plants modified with protectant genes designed to kill resistant insects can extend the usefulness of currently used pest-control methods and delay the development of pesticide-resistant bugs, according to Purdue University scientists and their collaborators from the University of Wisconsin-Madison, Monsanto Co., the U... | <urn:uuid:fc32b3f6-ff2e-409b-a726-497c698582d3> | 3.34375 | 339 | News Article | Science & Tech. | 13.865897 | 387 |
This comment has been deleted
Images courtesy Peter Vrsansky, Slovak Academy of Sciences
Published August 30, 2012
A glowing green cockroach would seem much easier to kill than our more familiar kitchen pests, but this particular insect evolved its own set of lights to avoid exactly such predatory attention, according ... | <urn:uuid:9bedc31c-d4fd-4fd2-aed2-84530d9583c2> | 3.421875 | 638 | News Article | Science & Tech. | 37.298416 | 388 |
Our main goal here is to give a quick visual summary that is at once convincing and data rich. These employ some of the most basic tools of visual data analysis and should probably become form part of the basic vocabulary of an experimental mathematician. Note that traditionally one would run a test such as the Anderso... | <urn:uuid:6697aede-f5b6-4d7b-b653-9cc6d6586fb4> | 3.5625 | 554 | Academic Writing | Science & Tech. | 42.204993 | 389 |
No for "dry", yes for "wet".
For "dry friction", such as a box on a floor, it is relatively constant. Why is this? Most objects are microscopically rough with "peaks" that move against each-other. As more pressing force is applied, the peaks deform more and the true contact area is increases proportionally. The surface... | <urn:uuid:55986c1f-03be-4b53-892f-8b50cf3b888c> | 3.203125 | 417 | Q&A Forum | Science & Tech. | 52.590476 | 390 |
Major Section: HISTORY
Example Forms: ACL2 !>:puff* :max ACL2 !>:puff* :x ACL2 !>:puff* 15 ACL2 !>:puff* "book"where
General Form: :puff* cd
cdis a command descriptor (see command-descriptor) for a ``puffable'' command. See puff for the definition of ``puffable'' and for a description of the basic act of ``puffing'' a ... | <urn:uuid:7bd5fd8e-4c80-4b18-a90d-19caa3325195> | 3.203125 | 605 | Documentation | Software Dev. | 63.6203 | 391 |
C++ is the canonical example of a language that combines low-level and high-level features1. It doesn't simulate anything, it provides native support for almost every high-level construct you'll usually find in a common high-level language and almost every low-level construct you'll find in C.
But of course the terms a... | <urn:uuid:1057cee7-b38e-492a-9886-804e9b564515> | 3.515625 | 621 | Q&A Forum | Software Dev. | 43.192733 | 392 |
Caecilians are amphibians that lack limbs. They look a bit like earthworms or snakes and can grow up to 1.5 m (5 ft) in length. As they generally live underground, they are the most under-studied group of amphibians.
No. Some caecilians give birth to live young and some salamanders have larvae that essentially resemble... | <urn:uuid:138bc259-3bb8-4a53-9f8c-c3fe9db6130a> | 3.734375 | 3,558 | Knowledge Article | Science & Tech. | 50.889806 | 393 |
I always hear the “nuclear power is very dangerous” argument, and I realize whenever people hear the scary word “nuclear”, the think big bad explosions.
Did you know that the biggest nuclear meltdown in American history (there have only been two), the three mile island incident, happened very close to a crowded city. N... | <urn:uuid:100f35bd-3cfa-4f62-9144-c9a8900bf625> | 2.65625 | 304 | Personal Blog | Science & Tech. | 55.819242 | 394 |
|project overview > introduction
Solar MURI is a collaborative project studying magnetic eruptions
on the Sun and their effects on the Earth's space environment.
("MURI" stands for Multidisciplinary University Research Initiative,
a research program funded by DoD.) The aim of the project is to improve our
ability to pr... | <urn:uuid:a87cdbfd-3685-4fbd-bb92-5060dd564e48> | 3.53125 | 497 | About (Org.) | Science & Tech. | 5.97035 | 395 |
Question by Alexis: chemistry reaction problem?? about mass? please help! thanks!?
An experiment that led to the formation of the new field of organic chemistry involved the synthesis of urea, CN2H4O, by the controlled reaction of ammonia and carbon dioxide.
2 NH3(g) + CO2(g) CN2H4O(s) + H2O(l)
What is the mass of urea... | <urn:uuid:1f0694c7-c307-49e9-9302-c31b7f0251dc> | 2.96875 | 335 | Q&A Forum | Science & Tech. | 78.739294 | 396 |
|The Surprising Appearance of Nanotubular Fullerene D5h(1)-C90|
The previously undetected fullerene D5h(1)-C90—with a distinct nanotubular shape—has been isolated as the major C90 isomer produced from Sm2O3-doped graphite rods and structurally identified by single-crystal x-ray diffraction. Fullerenes are well-defined ... | <urn:uuid:2f9c3991-1432-4449-97f6-f09dea37f2f9> | 3.4375 | 1,108 | Academic Writing | Science & Tech. | 49.6411 | 397 |
Science Fair Project Encyclopedia
Chalcedony is one of the cryptocrystalline varieties of the mineral quartz, having a waxy luster. It may be semitransparent or translucent and is usually white to gray, grayish-blue or some shade of brown, sometimes nearly black. Other shades have been given different names. A clear re... | <urn:uuid:e588db7b-ec20-4a2f-a0ec-63d57c6f1119> | 3.78125 | 197 | Knowledge Article | Science & Tech. | 44.505086 | 398 |
Joined: Oct. 2006
Ever hear of the Bacterial Flagellum? Upon electron microscope examination, it looks very much like a machine!
In fact, it bears a strong resemblance to an outboard motor, you know, the kind you see on the back of those small aluminum-fishing boats.
Any way, the Bacterial Flagellum is what scientists ... | <urn:uuid:4bd9bc64-1499-49d0-b513-8236057bf840> | 3.796875 | 212 | Q&A Forum | Science & Tech. | 50.977998 | 399 |