text large_stringlengths 148 17k | id large_stringlengths 47 47 | score float64 2.69 5.31 | tokens int64 36 7.79k | format large_stringclasses 13
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Want to stay on top of all the space news? Follow @universetoday on TwitterWe keep sending missions to Mars with the key objective to search for past or present life. But what if a huge impact early in the Red Planet’s history hindered any future possibility for life to thrive? Recent studies into the Martian “crustal ... | <urn:uuid:b9afece9-df12-4944-b4a5-e5a50a7a2548> | 4.1875 | 864 | Truncated | Science & Tech. | 36.890406 |
Portrait of Niels Bohr
The Niels Bohr Archive, Copenhagen
Niels Bohr was a Danish physicist who lived between 1885-1962. He studied the structure of atoms and developed a new theory about how the electrons in an atom were arranged.
After helping build the first nuclear bomb, Bohr spent the later years of his life encou... | <urn:uuid:c9fb30af-2444-4f53-9d2e-7de1ae8d8bbe> | 3.34375 | 507 | Content Listing | Science & Tech. | 59.534537 |
February 12, 2001 Winter Weather Event and
the "Seeder - Feeder Mechanism"
Background information on the February 12, 2001 Winter Weather Event.
On February 12, an ice storm, consisting primarily of sleet, was expected over the
RAH CWFA. The heaviest sleet was expected during the morning between 12Z and 18Z.
In retrosp... | <urn:uuid:212faeb0-a9cf-4ab3-8a40-5eb59806f057> | 2.984375 | 3,596 | Academic Writing | Science & Tech. | 42.183361 |
Previous Article: Doubly Linked List Next Article: Deletion of a Node from Doubly Linked List.
Insertion of a NodeBefore we discuss about how to insert a NODE let us discuss few rules to follow at the time of insertion.
- Check the location into which the user want to insert a new NODE. The possible locations where an ... | <urn:uuid:ddd92b1b-5fe8-43df-9ae5-975b5d164813> | 3.421875 | 359 | Tutorial | Software Dev. | 58.896475 |
See also the
Dr. Math FAQ:
0.9999 = 1
0 to 0 power
n to 0 power
0! = 1
dividing by 0
Browse High School Number Theory
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Infinite number of primes?
Testing for primality.
What is 'mod'?
- Prime Number Th... | <urn:uuid:e41d70b9-2e69-40da-a91f-b6e9400d15a1> | 2.953125 | 2,195 | Q&A Forum | Science & Tech. | 86.450387 |
Grouping constructs allow you to capture groups of subexpressions and to increase the efficiency of regular expressions with noncapturing lookahead and lookbehind modifiers. The following table describes the Regular Expression Grouping Constructs.
|( )||Captures the matched substring (or noncapturing group; for more in... | <urn:uuid:9b30ec7c-bd9b-475c-abf3-a52752c405b4> | 2.96875 | 676 | Documentation | Software Dev. | 39.546553 |
The basic results of the recent efforts concerning observations of gas deficiency in cluster spirals can be summarized as follows:
After 15 years of effort, the cluster samples are significant but not terribly large, and statistical studies are still plagued by small numbers, especially when one is trying to investigat... | <urn:uuid:6db94681-7f15-45fc-b71f-d7cbdd6cd952> | 3.203125 | 864 | Academic Writing | Science & Tech. | 37.967625 |
The Perseid meteor shower happens every year around mid-August.
This year's peak nights will be during the early morning hours of August 12th and 13th. During the shower you'll be able to see up to 60 meteors per hour.
What is a meteor shower?
A meteor is a tiny dust particle that a comet sheds. These dust particles re... | <urn:uuid:74aa5029-f443-498f-bf6c-1636d5f82678> | 3.53125 | 466 | Knowledge Article | Science & Tech. | 67.366353 |
Mapping The Genomes Of Crocodiles And Alligators - It's Not For The Faint Of Heart!
David Ray never turns his back on his research, and with good reason! Ray and his team study alligators, crocodiles, and bats, among other creatures. With support from the National Science Foundation (NSF), this multidisciplinary team f... | <urn:uuid:ef7b2b34-87b1-4020-a58d-ff7a0211e785> | 3.40625 | 221 | Truncated | Science & Tech. | 39.922201 |
Browse Other Climate Resources
Here are additional resources relating to aspects of Climate Change from the SERC catalog. These resources have not been reviewed by the Climate Change Collection review team.
: Greenhouse Effect
[link browse_local.html?search_text=carbon cycle&search 'Carbon cycle']|
[link browse_local.h... | <urn:uuid:6e708047-7b01-4526-9ac0-7bb8687ad4db> | 2.828125 | 639 | Content Listing | Science & Tech. | 36.995012 |
Since its discovery in 1801, Ceres (right) has been classified as a planet, an asteroid and a dwarf planet. It is the nearest dwarf planet to our sun.
Dawn traveled 2.8 billion kilometers (1.8 billion miles) to get from Earth to Vesta. It will travel another 1.6 billion kilometers (990 million miles) to get to Ceres.
D... | <urn:uuid:edbfc9e1-9c68-4177-ab98-ec818838c284> | 3.421875 | 125 | Knowledge Article | Science & Tech. | 72.887222 |
Josephson received the 1973 Nobel Prize in Physics for discovery of the Josephson effect, which occurs in two superconducting layers separated by an insulating oxide. Under certain conditions current can pass through the insulator through tunneling of Cooper pairs of electrons. The effect has been used to design superc... | <urn:uuid:a3d380a3-f81a-4a21-92ba-249ff5aa55ff> | 3.84375 | 370 | Knowledge Article | Science & Tech. | 33.388882 |
The Power Behind The Throne
Peter J. D'Adamo, ND, MIFHI
Although just about everyone knows something about DNA, I’d like to take a few moments to introduce you to RNA, the real power behind the throne.
Protein represents what biologists call phenotype – the living, breathing, metabolizing part of life. DNA is informati... | <urn:uuid:e3d75442-1189-4c32-b265-7a5d0a75c29f> | 2.78125 | 1,109 | Personal Blog | Science & Tech. | 45.649526 |
Scientists are building a DNA library of the entire planet, a vast index of everything that's alive (including some things that might soon not be). But a recent study cautions researchers to be careful, as a scanning mistake here could have more severe consequences than getting overcharged at the checkout.
The Internat... | <urn:uuid:91a04259-d636-4ad3-a02f-077109cac7a6> | 2.984375 | 528 | Personal Blog | Science & Tech. | 31.97743 |
New Emperor Penguin Colonies Found in Antarctica
While about 2500 chicks of emperor penguins were raised this year at the colony close to the French Dumont d'Urville Station, two new colonies totalling 6000 chicks have just been observed about 250 km away, near Mertz Glacier by the scientists Dr André Ancel and Dr Yvon... | <urn:uuid:075117c4-5cbd-4d35-84d5-e7cf8b699fbf> | 2.953125 | 461 | Truncated | Science & Tech. | 44.455021 |
1 gigajoule = 277.78 kilowatt-hour.
(GJ) - One billion Joules or a thousand Mega Joules.)
a measure of heat or energy
A unit of energy equaling 943,213.3 Btu.
One billion joules. Annual gas usage of residential and commercial customers measured in gigajoule.
A joule is an international unit of energy defined as the ene... | <urn:uuid:ab620dac-e4f8-46c2-8a89-3be4886c58d2> | 3.0625 | 402 | Structured Data | Science & Tech. | 62.616458 |
OpenGL Shading Language
This document describes a programming language that is a companion to OpenGL 2.0 and higher, called The OpenGL Shading Language. The OpenGL Shading Language is part of the core OpenGL 4.3 specification.
- GLSL Reference Pages
- OpenGL 3.3 & GLSL
- OpenGL 4.1 & GLSL Quick Reference Guide
- OpenGL... | <urn:uuid:dcf64032-804f-48c0-8b69-d7425ff082f3> | 3.296875 | 337 | Documentation | Software Dev. | 40.195478 |
In 9847 a Sophic long range probeship, exploring along a line to anti-spinward and Rimward of the Periphery discovered an anomalous light signature while travelling through interstellar space. Upon altering course and performing a high-speed flyby of the phenomenon, the probe was able to determine that the light signat... | <urn:uuid:05f755db-4973-4e22-b12a-1a133920bca3> | 3.9375 | 811 | Knowledge Article | Science & Tech. | 32.490243 |
The STORM model provides an estimate of the expected change in the ionosphere during periods of increased geomagnetic activity. The model estimates the departure from normal of the F-region critical frequency (foF2) every hour of the day for the current and previous day. Values are given in six separate geomagnetic lat... | <urn:uuid:fc799baf-337a-4795-93a9-a638fa553587> | 2.9375 | 1,000 | Knowledge Article | Science & Tech. | 49.179207 |
Can you imagine living without the vertebrae in your neck? Surely no animal on earth has a backbone that doesn't connect with its skull. Think again ...
Larval (baby) fishes have skeletons made of cartilage. As the fish grows the cartilage ossifies (changes to bone). In the vast majority of bony fishes most of the flex... | <urn:uuid:4209c8be-758c-427c-9e94-7eec89d66a04> | 3.59375 | 601 | Knowledge Article | Science & Tech. | 49.099599 |
“…A Cal Tech seismologist was aware of the natural forces that are working slowly but inexorably under the earth, out of sight, unnoticed, setting off reactions and counterreactions in fragile earth faults deep in the bowels of the earth. There was no reliable way, despite all the scientific research, to predict them —... | <urn:uuid:89130d41-d4c2-4b0a-b0c3-d3e75e224d6f> | 2.859375 | 233 | Personal Blog | Science & Tech. | 41.039354 |
Most forecasting is easier and more reliable in the short run than over the long haul. Think of weather prediction. (And history is full of failed long-term forecasts of everything from oil prices to human population trends.)
But for scientists studying the fate of the vast ice sheets of Greenland and West Antarctica, ... | <urn:uuid:bb64bd05-e772-4c49-a22a-19149e00c0ec> | 3.1875 | 1,194 | Nonfiction Writing | Science & Tech. | 43.950756 |
|s-block in the periodic table|
||This article is in a list format that may be better presented using prose. (March 2013)|
The s-block is a block in the periodic table that consists of the first two groups, namely the alkali metals and the alkaline earth metals. The elements in the s-block generally exhibit well-define... | <urn:uuid:cdb91b30-f53c-4d5b-98c4-0ee4c5be7fc0> | 3.578125 | 881 | Knowledge Article | Science & Tech. | 48.409832 |
To begin with it's a well known result in gravitation that the sphere has geometry such that for gravitational calculations all it's mass can be considered to be concentrated at its centre for objects outside of its radius.
Second there is another result that states that if inside a spherical shell then there is no gra... | <urn:uuid:8a834973-80a1-4520-8176-9df1974a935c> | 3.8125 | 386 | Q&A Forum | Science & Tech. | 41.321248 |
This 3 part problem deals with functions from the set P of cell phones in use in the US to the set of natural Numbers N.
a) Write one interesting function f:P N that is injective. Define the function by giving a rule for it, i.e., (f(x)=...)
b) write a function f:P N that is not injective. Again, give a rule
c) Explain... | <urn:uuid:79b3bb3f-c423-498c-9dce-8bdf99d33884> | 2.890625 | 103 | Q&A Forum | Science & Tech. | 90.794153 |
John Matese and Daniel Whitmire, from the University of Louisiana at Lafayette, are claiming that data from NASA’s Wide-field Infrared Survey Explorer already suggests that there is a large planet in the outer solar system. This hypothetical planet, which they have nicknamed Tyche, orbits the sun at 15,000 AU’s and wei... | <urn:uuid:ee27cb3d-7482-44a0-9837-ae0c9240f9b7> | 3.3125 | 290 | Personal Blog | Science & Tech. | 55.124319 |
White Dwarf Star Spirals
Photograph courtesy NASA/Tod Strohmayer (GSFC)/Dana Berry (Chandra X-Ray Observatory)
About 1,600 light-years away, two dense white dwarfs in the J0806 binary star system orbit each other once every 321 seconds. When they reach the end of their long evolutions, smaller stars typically become wh... | <urn:uuid:03384b78-655b-40d9-b92a-595c1f446a16> | 3.5 | 317 | Content Listing | Science & Tech. | 53.661333 |
|Recognized since antiquity and depicted on the
shield of Achilles according to Homer,
stars of the
form the head of the constellation Taurus the Bull.
Their general V-shape is anchored by
the eye of the Bull and by far the constellation's brightest star.
Yellowish in appearance, red giant Aldebaran is not a Hyades clu... | <urn:uuid:e54cc1f2-425b-487c-abcc-9e4b24195e83> | 3 | 257 | Knowledge Article | Science & Tech. | 41.244469 |
Included here are more in depth explanations of some of the terms and processes in the Nuclear Fuel Cycle.
Nuclear Fuel is produced utilizing various elements and compounds in reactions that yied the product desired at the various stages. Initially uranium is the prime constituent looked for in its natural setting duri... | <urn:uuid:bb07d3a7-3da0-4ffa-842e-8015a1f3b547> | 4.125 | 3,194 | Knowledge Article | Science & Tech. | 38.11429 |
The Message widget is a variant of the Label, designed to display multiline messages. The message widget can wrap text, and adjust its width to maintain a given aspect ratio.
When to use the Message Widget
To create a message, all you have to do is to pass in a text string. The widget will automatically break the lines... | <urn:uuid:89a05ea1-f000-4d50-8c76-05ebbedd7802> | 2.984375 | 803 | Documentation | Software Dev. | 54.922008 |
Describing Motion with Diagrams
Visit The Physics Classroom's Flickr Galleries and take a visual overview of 1D Kinematics.
Introduction to Diagrams
Throughout the course, there will be a persistent appeal to your ability to represent physical concepts in a visual manner. You will quickly notice that this effort to pro... | <urn:uuid:87dcf928-0fad-4198-b047-730821e5f217> | 4.21875 | 375 | Tutorial | Science & Tech. | 43.895728 |
Mechanics: Newton's Laws of Motion
Newton's Laws of Motion: Audio Guided Solution
Skydiving tunnels have become popular attractions, appealing in part to those who would like a taste of the skydiving experience but are too overwhelmed by the fear of jumping out of a plane at several thousand feet. Skydiving tunnels are... | <urn:uuid:2025d2ed-0d97-43f6-9bfc-e5957318fe85> | 3.546875 | 371 | Tutorial | Science & Tech. | 56.767316 |
|Mar26-09, 09:10 AM||#1|
Magnetic force on a wire
1. The problem statement, all variables and given/known data
A wire is oriented along the x-axis. It is connected to two batteries, and a conventional current of 2.3 A runs through the wire, in the +x direction. Along 0.27 m of the length of the wire there is a magnetic... | <urn:uuid:cd84d5f4-05b4-4f62-8e72-9994ec1df141> | 3.5 | 284 | Q&A Forum | Science & Tech. | 69.062983 |
All eyes will be on the new Mars rover Curiosity when it lands in just over two weeks, but lest we forget, NASA’s indefatigable Mars rover Opportunity is still rolling along, too. The rover has driven about 22 miles, which prompted some Olympic-minded NASA people to realize the rover is nearing marathon distance. It wi... | <urn:uuid:91199055-8c30-4720-9c1c-6196d220347a> | 2.9375 | 483 | Truncated | Science & Tech. | 46.493967 |
Studying the effects of rainfall on civet behaviour
Itís pretty easy to get lost when you venture deep into the Jungle of Lambusango on the Isle of Buton, just off the South East coast of Sulawesi in Indonesia - a fact that I discovered more than once and to the amusement of the local guides with whom I worked during m... | <urn:uuid:66c46207-2104-41e9-ae66-4642f6fa70a1> | 3.03125 | 2,298 | Personal Blog | Science & Tech. | 34.609654 |
The moon has never had all that much. It doesn't have atmosphere, it doesn't have water and it sure doesn't have life. What it does have, though, is dirt lots and lots of dirt and it's some of the coolest stuff you ever saw. Now it's even cooler, thanks to the discovery this week of a wholly unexpected ingredient stirr... | <urn:uuid:65e71147-f739-4215-a0d7-44fdeb1cb89f> | 3.65625 | 1,063 | Nonfiction Writing | Science & Tech. | 48.625853 |
(Note: If you're already familiar with chemical potentials, you may be interested in this alternative thermodynamic explanation.)
Two things happen when ice and water are placed in contact:
Molecules on the surface of the ice escape into the water
molecules of water are captured on the surface of the ice (freezing).
Wh... | <urn:uuid:82456d7a-489d-4b94-8475-0c74c32781b4> | 3.984375 | 964 | Tutorial | Science & Tech. | 45.151474 |
An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time
THE ANCIENT UNIVERSE
b) The Age of the Oldest Stars
Other stars may have different lifetimes. Stars smaller (less massive) than the Sun have longer lives because they fuse their hydrogen fuel so much more slowly. Similarly, a sub-compact car may ha... | <urn:uuid:15e8cc19-578b-4f33-b726-1bf680aec84b> | 3.75 | 433 | Knowledge Article | Science & Tech. | 41.11164 |
This September, Larry Crumpler, a research colleague at the New Mexico Museum of Natural History and Science, and I were able to fly in the back seats of two weight-shifting ultralight aircraft during a two-hour flight over the McCartys lava flow in central New Mexico. This flow is 3,000 years old and over 47 km (29 mi... | <urn:uuid:4e7f5492-bac5-458d-b994-b06c56311a08> | 2.703125 | 508 | Personal Blog | Science & Tech. | 32.178526 |
Continuous flow - A method of analysis where sample material is moved through a series of conversion and purification steps within a continuously flowing stream of carrier gas, typically helium. In most cases, this method allows for a single measurement of a sample.
Continuous flow interface - The carrier gas flow rate... | <urn:uuid:c3b8a093-8f35-40ec-ada6-88dec392b4ac> | 3.359375 | 495 | Knowledge Article | Science & Tech. | 28.445605 |
String objects have one unique built-in operation: the % operator (modulo) with a string left argument interprets this string as a C sprintf() format string to be applied to the right argument, and returns the string resulting from this formatting operation.
The right argument should be a tuple with one item for each a... | <urn:uuid:31b05556-69da-49a6-8e6d-41a9e851a9e1> | 4.28125 | 419 | Documentation | Software Dev. | 56.076853 |
This is a book report Rachel wrote for Ms Moore’s 3rd grade class this year.
Marie Curie changed the world through science. Marie and her husband discovered two new elements, polonium and radium. Marie and two other scientists won the Nobel Prize in physics. In 1910, she isolated radium in the form of a metal. Marie wo... | <urn:uuid:c74b54f3-6918-4b20-b1c8-5c78fbe4c75a> | 3.84375 | 245 | Personal Blog | Science & Tech. | 55.61318 |
Managing plant populations in fragmented landscapes: restoration or gardening? (Review)
Hobbs, R.J. (2007) Managing plant populations in fragmented landscapes: restoration or gardening? (Review). Australian Journal of Botany, 55 (3). pp. 371-374.
*Subscription may be required
Ecosystem fragmentation results in major ch... | <urn:uuid:37a8a71b-57e4-4949-8e94-e124f671a671> | 2.90625 | 331 | Academic Writing | Science & Tech. | 22.538507 |
UPDATE 11/2: At the Washington Post @bradplumer follows up this post with his own, providing a nice summary of the issue. He concludes: "aggressive steps to cut emissions could reduce the amount of sea-level rise by somewhere between 6 and 20 inches in 2100, compared with our current trajectory" -- which is just about ... | <urn:uuid:a1167fc8-3d7d-43c0-a9c9-a15c1abc67d7> | 2.90625 | 553 | Personal Blog | Science & Tech. | 42.633912 |
Authors: Charles B. Leffert
ABSTRACT The success of quantum theory shows that the Universe is much more complicated than most have supposed. How did our universe get started? What is energy? What is gravity? The late Richard Feynman in Volume 1 of his “Lectures on Physics” said that no one had come up with the machiner... | <urn:uuid:3b92e652-494c-460a-ba14-d21992da079a> | 2.984375 | 444 | Academic Writing | Science & Tech. | 36.4175 |
With the DOM, you can access every node in an XML document.
Access a node using its index number in a node list
This example uses the getElementsByTagname() method to get the third <title> element in "books.xml"
Loop through nodes using the length property
This example uses the length property to loop through all <titl... | <urn:uuid:3c8fb642-cdb0-4f9c-957a-8609040f31f1> | 3.46875 | 508 | Documentation | Software Dev. | 50.985484 |
The most used definition of electronegativity is that an element's electronegativity is the power of an atom when in a molecule to attract electron density to itself. The electronegativity depends upon a number of factors and in particuler as the other atoms in the molecule. The first scale of electronegativity was dev... | <urn:uuid:9b47acc3-a1ff-4811-98d9-c53686607c66> | 3.90625 | 248 | Knowledge Article | Science & Tech. | 39.439734 |
Science Fair Project Encyclopedia
Pleocyemata is a sub-order of decapod crustaceans, erected by Martin Burkenroad in 1963. Burkenroad's classification replaced the earlier sub-orders of Natantia and Reptantia with the monophyletic groups Dendrobranchiata (prawns) and Pleocyemata. Pleocyemata contains all the members of... | <urn:uuid:132685e8-cf44-452f-9d2c-e2f2208b7e97> | 3.40625 | 290 | Knowledge Article | Science & Tech. | 44.707991 |
Analytical chemistry is concerned with the measurement of the chemical compostion of unknown substances using exisitng instrumental techniques, and the development or application of new techniques and instruments. Anytime a measurement is made with an instrument, there is an error, a deviation from the true value, ineh... | <urn:uuid:d3288014-8756-472d-87d8-73378cb85123> | 3.75 | 483 | Tutorial | Science & Tech. | 20.570477 |
NASA’s Dawn spacecraft obtained this image with its framing camera on August 12, 2011. This image was taken through the framing camera’s clear filter. The image has a resolution of about 260 meters per pixel.
The Dawn mission to Vesta and Ceres is managed by the Jet Propulsion Laboratory, Pasadena, Calif., for NASA's S... | <urn:uuid:0cf44b33-0b32-4fa6-b283-f045e3964d4b> | 3.140625 | 281 | Knowledge Article | Science & Tech. | 45.544221 |
By yamalaris on Tuesday, July 22, 2008 - 02:52 pm: Edit Post
I understand that northern lights are the result of activity from the surface of our Sun, is there a time of the year this activity is more prevalent? Is there a way to predict or forecast northern lights activity?
Thank you in advance for your answer.
By adm... | <urn:uuid:85e61ffc-e571-4029-b042-1d05e7d29559> | 3.09375 | 729 | Comment Section | Science & Tech. | 47.356106 |
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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Topic review (newest first)
Kaboobly doo! Oh wait, I liked A too. Brilliant answer then.
It turned out to be .217 as a correct answer
Yes, you are right. If shape A is tran... | <urn:uuid:49dd6808-3ec2-4601-8db5-4d27db347d23> | 2.953125 | 334 | Comment Section | Science & Tech. | 98.055277 |
MessageToEagle.com - A vast structure of satellite galaxies and clusters of stars surrounding our Galaxy,
stretching out across a million light years has been discovered by astronomers from the University of Bonn in Germany .
The work challenges the existence of dark matter, part of the standard model for the evolution... | <urn:uuid:f1a1789d-f464-4a0b-ba87-7220382dba11> | 3.65625 | 1,394 | Content Listing | Science & Tech. | 42.685142 |
Designing a JSF Page
The first thing you want to do after getting the page open in the
designer is to expand the palette on the right hand side of the
design by clicking the left arrow on the top of it:
The palette will read the tag libraries out of your build path
and load them so you can utilize the Drag and Drop int... | <urn:uuid:cdb624d1-7490-4771-b36d-70df08f4b5a9> | 2.6875 | 820 | Tutorial | Software Dev. | 48.862918 |
Same Genes, Different Doses
Distant DNA controls gene activity
Context: Even in cases where two people share the same gene, they can produce widely differing amounts of the protein the gene codes for. This can lead to differences in physical characteristics, and it can also mean the difference between sickness and heal... | <urn:uuid:6ee3ad16-fe67-47e1-b25b-f2f9101d87a0> | 4.0625 | 465 | Truncated | Science & Tech. | 32.734375 |
(diff) ←Older revision | Current revision | Newer revision→ (diff)
Dragon Breed Data
Origin Of Name?
There are several Australian butterflies with "Xenica" in their common names from the parent genera Geitoneura, Oreixenica, and Nesoxenica. The first named variety was the Ringed Xenica in 1805, with marbled orange/blac... | <urn:uuid:42c80edc-ca34-4282-85c2-0ebea99f1d2b> | 2.9375 | 130 | Knowledge Article | Science & Tech. | 24.325333 |
Are humans the only animals that keep livestock?
If the best guess of biologists proves toe be true, the answer is a surprising ‘no.’ We already know that ants practice a primitive form of agriculture - collecting leaf fragments to grow tasty fungus - and even cultivate aphids in order to ‘milk’ them of their honeydew,... | <urn:uuid:2434062e-7daf-4ff6-a35c-19c60d2fa609> | 3.140625 | 223 | Personal Blog | Science & Tech. | 36.991241 |
C# String Theory—String intern pool
|Visual C# Tutorials|
String intern pool
The string intern pool is a table that contains a single reference to each unique literal string declared or created programmatically in your application. The Common Language Runtime (CLR) uses the intern pool to minimize string storage requir... | <urn:uuid:4626dbfd-8284-45cb-aff4-fb72a20610ba> | 3.046875 | 498 | Documentation | Software Dev. | 39.009361 |
Photograph by Gabi Moisa/Shutterstock
Washing machines are second only to toilets as the largest water users in the home, accounting for 14 percent of household water use. Household water consumption has a significant impact on aquatic life, especially when water supplies come from freshwater lakes and streams. The Rio... | <urn:uuid:ec5c6bfa-b3b8-4e35-bcb6-0f3b23a5f8c7> | 3.078125 | 548 | Knowledge Article | Science & Tech. | 39.44566 |
When the debugger is entered, it displays the previously selected buffer in one window and a buffer named ‘*Backtrace*’ in another window. The backtrace buffer contains one line for each level of Lisp function execution currently going on. At the beginning of this buffer is a message describing the reason that the debu... | <urn:uuid:32df05f2-ddfc-4b78-a4e8-7d7e0feb4c39> | 2.96875 | 422 | Documentation | Software Dev. | 41.675595 |
Bending the Light fantastic
Lasers make a bright beam of light. Shine the beam through a large page-magnifier fesnel lens to show how the lens bends light to create images.
A small low power laser such as a laser pointer.
A page magnifier fresnel lens
cardboard with a white side to use as a screen
steel support, such a... | <urn:uuid:bf1f5433-dc6e-4080-96cc-12286e6ec445> | 4.0625 | 1,040 | Tutorial | Science & Tech. | 67.420365 |
Miconia is one of the most destructive invaders in insular tropical rain forest habitats. It is a serious threat to ecosystems in the Pacific because of its ability to invade intact native forests. Miconia has earned itself the descriptions such as the “green cancer” of Tahiti and the “purple plague” of Hawaii. Once mi... | <urn:uuid:a65dc8cb-b7d0-4555-8fd0-2fca37c11bbb> | 3.921875 | 686 | Knowledge Article | Science & Tech. | 23.991178 |
NASA In Deep Water
To the uninitiated, it’s not immediately obvious why NASA would be sponsoring an expedition into the deepest known sinkhole on Earth. On the other hand, the involvement of Environmental Science and Engineering Professor John Spear is a little more apparent—he’s a microbiologist and in this more than ... | <urn:uuid:bf8e6725-a1fc-4599-b608-42f3e65a7227> | 3.546875 | 1,542 | Content Listing | Science & Tech. | 22.598386 |
Core Temperature of Sun
How do scientist know the sun's core temperature?
This is a good question, after all, we have no direct access to the sun's
core, but if we apply some knowledge of physics, we can get to a reasonable
approximation quite readily.
First, we have to understand that the sun is mostly gas-like partic... | <urn:uuid:8de2ad13-db9e-4c77-8420-3bb72129700e> | 3.71875 | 457 | Knowledge Article | Science & Tech. | 62.912994 |
Terms such as ‘red tide’ and ‘global warming’ are catchy but lead to misconceptions.
Words matter. Take the term “red tide,” which is the popularized way of talking about blooms of harmful marine algae. This common terminology is a misnomer because the blooms are not always red and their movement is largely unrelated t... | <urn:uuid:3a073533-60c1-40f7-8e62-b2f76510fb1c> | 3.265625 | 453 | Personal Blog | Science & Tech. | 46.481513 |
One boring Monday morning in the lab a group of us did the experiment, and to our surprise we found that the hot water (in sealed containers) did freeze faster.
On closer examination we discovered that the shelves in our freezer were covered in frost, like I imagine most freezers, and the hot water was melting the fros... | <urn:uuid:93796662-37d4-4b1e-926d-9a102bb9e035> | 2.75 | 193 | Q&A Forum | Science & Tech. | 50.44 |
Have you ever wondered why all mammals have a tail, but man does not?
All species of animals, including man, of course, have evolved very gradually over millions of years. In this way, each animal strengthens and improves those parts of its body that are particularly useful, and the various parts that are not so useful... | <urn:uuid:2c03b666-e138-4115-816c-b848976930df> | 3.734375 | 281 | Personal Blog | Science & Tech. | 60.886473 |
An initial report on the 24-hour count that began midnight Monday and ended midnight Tuesday included 233 different species — a drop of 11 from last year when 244 were counted on Mad Island. While the area likely still has one of the United States' most diverse bird populations, the species that were missing raise ques... | <urn:uuid:7c35fe75-b7ce-4892-8c81-315a0bb0ae6b> | 3.203125 | 144 | Comment Section | Science & Tech. | 50.941923 |
seed germination and fertilizer
bae at oci.utoronto.ca
Wed Feb 1 18:07:08 EST 1995
In article <3gm9hv$777 at newsbf02.news.aol.com> cheesenips at aol.com (CheeseNips) writes:
>hello! I am trying to help a student determine if there is any
>difference in seed germination when fertilizer is used. If anyone can
>help, it ... | <urn:uuid:5642edd6-9926-46cc-b0c8-ff54ef19962e> | 3.0625 | 230 | Comment Section | Science & Tech. | 54.995113 |
Common loons defend breeding territories on fresh water lakes in the northern US and Canada. While a great deal is known in general about their breeding biology it was the advent of banding that enabled identification of individual loons.
Cornell professor of neurobiology and behavior Charles Walcott and colleagues Wal... | <urn:uuid:a321549f-fb8c-49ef-8cf2-fae1ce3d3c65> | 3.5625 | 200 | Truncated | Science & Tech. | 42.002143 |
New Native Languages, May 08, 2012 D, Go, Vala, and Rust: A new generation of native languages.
D is the brain-child of Dr. Dobb's blogger Walter Bright. Like all the other languages discussed here, it's fundamentally an OO language with numerous features that push it into different areas of programming. Originally con... | <urn:uuid:ee6563a7-d89c-4f97-8c65-cc5026c115ec> | 2.859375 | 185 | Personal Blog | Software Dev. | 32.438647 |
Electromagnetic radiation is a combination of oscillating electric and magnetic fields propagating through space and carrying energy from one place to another. Light is a form of electromagnetic radiation. The theoretical study of electromagnetic radiation is called electrodynamics, a subfield of electromagnetism.
Any ... | <urn:uuid:bf0af722-50ea-48a9-b02d-58a0d49fce3a> | 4.09375 | 462 | Knowledge Article | Science & Tech. | 29.595229 |
||Topex was JPL's follow-on to the Seasat-A mission of 1978. Unlike Seasat, Topex had just one scientific instrument, a radar altimeter designed to measure sea surface height. Surface height is directly related to temperature, tides and currents, all of which are important to oceanographers and meteorologists. But in t... | <urn:uuid:79ae505e-6e77-4a01-8e62-5e2a944f0424> | 3.40625 | 332 | Knowledge Article | Science & Tech. | 41.465854 |
Space history was made on February 12, 2001 when NASA's NEAR spacecraft became the first craft to land on an asteroid. What makes this landing even more exceptional is that NEAR, managed by the Applied Physics Lab at Johns Hopkins University, was not built to withstand a landing; its mission was to orbit asteroid Eros ... | <urn:uuid:00bf9a63-85b1-4f8e-bfc8-a56898e19be1> | 3.484375 | 1,015 | Audio Transcript | Science & Tech. | 63.665302 |
will calculate simple statistical measures between two minc
files or more by comparing all subsequent files to the first.
The results for each subseqent file are then returned in order.
By default all statistics are calculated. If specifitc statistics
are requested via a command-line option, then only the requested
sta... | <urn:uuid:fa75a467-5dc0-4da7-9882-8c3c977122b1> | 2.734375 | 521 | Documentation | Software Dev. | 49.453856 |
Present climate is determined from analysis of meteorological observations. Climates of the past may be deduced by studying proxy data such as ice-cores, tree-rings, pollen, etc. Future climate changes may be estimated by means of computer simulations using programs known as General Circulation Models or Climate Models... | <urn:uuid:8956a4ec-f79d-40f5-8f76-428843b0fd38> | 3.90625 | 1,289 | Academic Writing | Science & Tech. | 27.726165 |
8 images of impact craters in space
Tue, Nov 06 2012 at 7:05 PM
An estimated half million asteroids are flying around our solar system, ranging from the size of baby planets to particles of dust. With so many objects winging about in space, it’s no wonder that the planets and moons of our solar system are pitted with c... | <urn:uuid:52808130-3417-4ac4-b62f-a8edd7961b80> | 2.8125 | 98 | Truncated | Science & Tech. | 51.159959 |
What are the special conditions necessary for fossils to form? Usually, if something dies, it either rots away from bacteria and fungus, or is eaten by animals. (Scavengers are animals that live off of dead flesh.) So, a major factor in forming a fossil is rapid burial. This protects the organism from being eaten or ex... | <urn:uuid:2a44f2b9-99f9-4f3c-9b92-395168421927> | 3.578125 | 71 | Knowledge Article | Science & Tech. | 52.116172 |
Created by Roger Edwards, Storm Prediction Center
In this enhanced water vapor image, color progressions from gray thru bright blue to deep blue indicated more moisture; while black through deep red means drying. Often, areas of strong drying correspond to sinking motion in the upper levels; and areas of high moisture ... | <urn:uuid:1dcbab73-2697-401f-81a5-1d0673c3d3e5> | 3.515625 | 284 | Knowledge Article | Science & Tech. | 39.428796 |
NOTE: Click on the images to view them at their highest resolution.
This is a six image sequence showing the collision of fragment H of Comet Shoemaker-Levy 9 with Jupiter. The frames were taken over a three hour period on the 18th of July, 1994, using the MAGIC infrared camera on the 3.5 meter telescope on Calar Alto.... | <urn:uuid:a3b7f02e-144c-4116-b719-56512800ef6d> | 3.046875 | 640 | Knowledge Article | Science & Tech. | 48.272293 |
Petford, N. and Koenders, M.A., 2001. Consolidation phenomena in sheared granitic magma: effects of grain size and tortuosity. Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, 26 (4-5), pp. 281-286.
Full text not available from this repository.
Official URL: http://www.sciencedirect.com/science?_ob=... | <urn:uuid:4b73956b-9978-4a56-8a95-f19e6f71657f> | 2.8125 | 418 | Academic Writing | Science & Tech. | 48.085 |
If a is the radius of the axle, b the radius of each ball-bearing, and c the radius of the hub, why does the number of ball bearings n determine the ratio c/a? Find a formula for c/a in terms of n.
Which is larger cos(sin x) or sin(cos x) ? Does this depend on x ?
Find the exact values of some trig. ratios from this re... | <urn:uuid:33e31ba8-be09-4f75-a5a1-3a49a8e0c1eb> | 3.046875 | 104 | Q&A Forum | Science & Tech. | 88.760894 |
Last July, a chartered fishing boat strewed 100 tonnes of iron sulphate into the ocean, off the western coast of Canada. The goal was to supercharge the marine ecosystem. The iron was supposed to fertilize plankton, boost salmon population and sequester carbon. Currently, it’s still unclear whether the ocean responded ... | <urn:uuid:17da8785-9909-4085-9965-f6a672e596cf> | 2.921875 | 98 | Truncated | Science & Tech. | 27.223579 |
I was lucky enough to see a talk by Barbara Liskov, the grande dame of computer science. The talk was titled “The Power of Abstraction,” and it covered Liskov’s work on programming languages in the 1970s and 1980s, primarily a language called CLU.
Update 1/14/2010: Video of the same talk is available here: OOPSLA Keyno... | <urn:uuid:239fa43c-d99b-4c93-848a-d8e1bfeecb8e> | 2.71875 | 688 | Personal Blog | Software Dev. | 42.25416 |
Near the center of this sharp cosmic portrait, at
the heart of the Orion Nebula,
are four hot, massive stars
Gathered within a region about 1.5 light-years in radius,
they dominate the core of the dense Orion Nebula Star Cluster.
Ultraviolet ionizing radiation from the Trapezium stars,
mostly from the brightest star
po... | <urn:uuid:9149c5b7-e4f8-4692-93ed-4972a87a7f32> | 3.8125 | 201 | Knowledge Article | Science & Tech. | 38.784688 |
The topic of this article is focused around zooming in a perspective OpenGL view. I wrote this article because I found some examples of zooming in a OpenGL view using ortho projections. But the most advanced example that I found using perspective projections, don't implement a true zooming but simulate the zooming effe... | <urn:uuid:1ea7819c-5d4f-48ac-9bfe-9b160391ee2b> | 2.875 | 228 | Documentation | Software Dev. | 31.823197 |
Have some satellite data showing 2010 to be -- by a significant margin -- the hottest year in the satellite record. Just look at the very top line for 2010, with the rectangle at the end showing the most recent reading.
You will want to check all the boxes at the bottom of the graph and then select "redraw" to show the... | <urn:uuid:c4a9a6fa-a88a-44af-9b8b-136dd9a03745> | 3.328125 | 1,763 | Comment Section | Science & Tech. | 50.951932 |
This article has been reviewed by the following Topic Editor: C Michael Hogan
Atlantic Water (AW) is a water mass traditionally defined as any water with salinity greater than 35.0 entering the Arctic domain from the Atlantic domain.
This article is written at a definitional level only. Authors wishing to expand this e... | <urn:uuid:61d2478c-fda2-489a-b207-9d908b1db994> | 3.265625 | 412 | Knowledge Article | Science & Tech. | 50.093026 |
The Karner Blue Butterfly
Lycaedes melissa samuelis
Walk into one of nature’s unique ecosystems in the Northeast, a pine barren, on a still, hot July day. You'll smell the aroma of pine. You'll sense the dryness of the air, and if you are fortunate, you'll see the fluttering of small iridescent blue wings against a bac... | <urn:uuid:a62df826-9174-401f-a00f-311009dea1fc> | 3.71875 | 970 | Knowledge Article | Science & Tech. | 42.687299 |
Faster-than-light communication AUG 18 2008
On the basis of their measurements, the team concluded that if the photons had communicated, they must have done so at least 100,000 times faster than the speed of light -- something nearly all physicists thought would be impossible. In other words, these photons cannot know ... | <urn:uuid:60335297-1f88-4df1-920c-919cb3554f28> | 3.6875 | 104 | Personal Blog | Science & Tech. | 49.555714 |
Unit 1: Many Planets, One Earth // Section 10: Further Reading
University of California Museum of Paleontology, Web Geological Time Machine, http://www.ucmp.berkeley.edu/help/timeform.html. An era-by-era guide through geologic time using stratigraphic and fossil records.
Science Education Resource Center, Carleton Coll... | <urn:uuid:ffc30444-14b5-4c80-ba05-0f9b595091e8> | 3 | 208 | Content Listing | Science & Tech. | 32.54 |
> Larger images and animation available from NASA's Earth Observatory
Crack in the Petermann Glacier
Jesse Allen, using data provided courtesy of NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team
Michon Scott, NASA's Earth Observatory
Covering some 1,295 square kilometers (500 square miles) along the north... | <urn:uuid:1a2f180a-5d01-4723-928f-fb22ffa9afc0> | 4.125 | 482 | Knowledge Article | Science & Tech. | 41.923432 |
Putting Together the Arctic Puzzle
The Arctic is arguably one of the most perplexing places on Earth – so puzzling that an entire campaign has been dedicated to learning more about it. Nicola Blake, an associate researcher from the University of California, Irvine, is working on NASA's Arctic Research of the Compositio... | <urn:uuid:f524053d-fe4c-48c6-9dfc-7d8fd038c7b0> | 3.828125 | 608 | Nonfiction Writing | Science & Tech. | 37.966941 |
A NEW form of liquid crystal which behaves like rubber could one day be used to make components and to manipulate light in a new generation of optoelectronic circuits, which use light instead of electricity to communicate. At a conference held by the American Physical Society in St Louis last week, a West German resear... | <urn:uuid:3c22b700-1195-481b-95f8-564cdc1500c7> | 3.828125 | 210 | Truncated | Science & Tech. | 30.332941 |
Bring up a chimpanzee from birth as if it were a human and it will learn many unsimian behaviours, like wearing clothes and even eating with a knife and fork. But one thing it will not do is talk.
In fact, it would be physically impossible for a chimp to talk just like us, thanks to differences in our voice boxes and n... | <urn:uuid:99341bbc-2370-44f7-aea9-f6f066a3c699> | 3.53125 | 205 | Truncated | Science & Tech. | 49.816872 |
The first scientist to alert Americans to the prospect that human-caused climate change and global warming was already upon us was NASA climatologist James Hansen. In a sweltering Senate hall during the hot, dry summer of 1988, Hansen announced that "it is time to stop waffling ... The evidence is pretty strong that th... | <urn:uuid:e2b8aaa2-85ec-4e2a-9151-d7e851069ed4> | 2.921875 | 997 | Nonfiction Writing | Science & Tech. | 44.033244 |
Now I don't have to delete all those important ^#$#*&# PMs ... yet...
Thank you Magister!!!
Helium II is a superfluid, a quantum mechanical state of matter with strange properties .
The thermal conductivity of helium II is greater than that of any other known substance, a million times that of helium I and hundred of t... | <urn:uuid:5b1809c0-0e3b-406b-9cc0-e20dc53d2fe3> | 2.84375 | 229 | Comment Section | Science & Tech. | 54.607778 |
Sometimes Earth's magnetic poles switch places. That is called a magnetic reversal. These graphs show how often magnetic reversals happen. Black stripes show times when Earth's magnetic field was "normal" (like it is today). White stripes show times when the field was reversed. The graph on the left shows the past 160 ... | <urn:uuid:7e043e91-1f0c-4ba5-9240-6c52cb23f0c4> | 3.421875 | 91 | Knowledge Article | Science & Tech. | 74.745132 |
Silicon–oxygen and aluminum–oxygen compounds exhibit significant XPS Auger and photoelectron chemical shifts that are accurately measurable. Chemical state plots of KLL Auger kinetic energy versus 2p photoelectron energy permit identification of chemical species from the locations of their points on the plots. The KLL ... | <urn:uuid:cb0f144c-d68f-4b2b-bb1c-639376647b8b> | 3.140625 | 488 | Academic Writing | Science & Tech. | 23.448316 |
Space Science and Engineering Center website by University of Wisconsin-Madison's Graduate School shows a real time animation of the cloud cover over the North America continent. It gets the satellite images and shows animation by stitching those images together. With the help of it you can get an idea of what weather ... | <urn:uuid:8a72b0cd-1d73-4e96-9193-1292e2027ff5> | 3.046875 | 133 | Personal Blog | Science & Tech. | 50.1608 |