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
values | topic large_stringclasses 2
values | fr_ease float64 20 157 |
|---|---|---|---|---|---|---|
gets is dangerousThis tip submitted by carl johnson on 2006-07-21 13:13:35. It has been viewed 9031 times.
Rating of 8.1 with 78 votes
If we use this code:
char string[ 100 ]; printf("ENTER SENTENCE: "); gets(string);
we can introduce a bug or security vulnerability into our code!
The problem is that it allows someone ... | <urn:uuid:3b82dc65-cb62-4083-952d-7d9bb405a30f> | 3.21875 | 205 | Tutorial | Software Dev. | 69.545551 |
Caitlin Stier, video intern
A clip of giant crabs traipsing across the Antarctic sea floor takes second place in our countdown.
These monstrous crabs are swarming an Antarctic abyss, endangering an ecosystem crafted by 14 million years of evolution. Millions of the crustaceans, with bodies over a metre wide, have infil... | <urn:uuid:f91dd32b-e8c4-4327-8823-f5f52e3364da> | 3.5 | 174 | Listicle | Science & Tech. | 45.571373 |
See 2 video demonstrations of diffusion in action. The first video shows a drop of food coloring diffusing through water. It is a video that is time lapsed at 1 frame/15 seconds. The second video shows a Ziploc bag of iodine placed into a beaker of starch water. It is a video that is time lapsed at 1 frame/30 seconds. ... | <urn:uuid:e41a202a-b926-4bc4-8bf0-d86aa728bba6> | 3.765625 | 294 | Truncated | Science & Tech. | 63.236447 |
Everybody's favorite adorably-monikered, microscopic invertebrate continues to prove that it's also one tough little "bear". Water bears*—long recognized as hardiest animals on Earth—can also, apparently, survive in the vacuum of space, according to a European Space Agency experiment published in the journal Current Bi... | <urn:uuid:e5b04439-23de-45ce-a3eb-ec1485cda861> | 3.1875 | 470 | Personal Blog | Science & Tech. | 46.32608 |
PhotolysisWhat happens when light is absorbed by a molecule? Let's look at the absorption of a photon of light by a hydrogen molecule. If the photon of light contains just enough energy to promote an electron from the lower energy level to the upper one, the bond order decreases from 1 to 0. The bond is broken and two ... | <urn:uuid:1359e402-0fb7-4b17-8d44-46ca7ebfb4d3> | 3.28125 | 749 | Knowledge Article | Science & Tech. | 55.988837 |
A eutectic system is a mixture of chemical compounds or elements that have a single chemical composition that solidifies at a lower temperature than any other composition made up of the same ingredients. This composition is known as the eutectic composition and the temperature at which it solidifies is known as the eut... | <urn:uuid:8c06d95f-c5ff-467d-aadb-b1e0f59acce1> | 4.21875 | 2,272 | Knowledge Article | Science & Tech. | 45.427746 |
What Is Climate and Climate Change?
Our weather is always changing and now scientists are discovering that our climate does not stay the same either. Climate, the average weather over a period of many years, differs in regions of the world that receive different amounts of sunlight and have different geographic factors... | <urn:uuid:030e5a4f-db68-4f49-b6ce-e511eb551a87> | 3.90625 | 422 | Knowledge Article | Science & Tech. | 40.092741 |
Scope of this Manual
C is a flexible language that leaves many programming decisions up to you. In keeping with this philosophy, C imposes few restrictions in matters such as type conversion. Although this characteristic of the language can make your programming job easier, you must know the language well to understand... | <urn:uuid:bf36777e-cb46-43e2-afc1-6dbeb5da071b> | 3.59375 | 172 | Documentation | Software Dev. | 47.83464 |
|definition||a quantity that has
|a quantity that has both
magnitude and direction
|up, down, left, right
north, east, west, south
positive, negative (in a coordinate system)
angle of inclination, depression
angle with the vertical, horizontal
right ascension, declination
proper time (relativistic)
electric, magnetic, ... | <urn:uuid:7fec0735-9d7b-40b2-991b-e12dcaecb531> | 3.828125 | 429 | Structured Data | Science & Tech. | 55.496591 |
I was alerted to this by a post on the Bad Science forum. There one of the posters had used the position of Barnard’s Star to estimate the date a Google Sky image had been taken. Barnard’s Star has the highest proper motion of any star known. This means it moves across the sky compared to background stars. Looking at t... | <urn:uuid:09f7242f-edc6-4314-9a26-ea46f46cd9c8> | 3.125 | 1,139 | Personal Blog | Science & Tech. | 55.418389 |
Because our forum is being polluted with bad information.
Myth #1: When you hash something, you get a unique result that no other file or string or password can have.
Wroonnnnggggg. Let's attack this one with simple logic. Let's say your hash is 32 characters long. Now let's say you hash every possible 33-character str... | <urn:uuid:782fe768-83be-4055-a750-5cd7407f3c58> | 3.1875 | 2,047 | Comment Section | Software Dev. | 65.461072 |
Large collisions between asteroids transferred carbonaceous material in the inner solar system.
NASA's space probe Dawn is scheduled to leave asteroid Vesta on Wednesday, September 5th, and head for its next destination, the dwarf planet Ceres.
New results prove that Dawn’s target asteroid Vesta is a relict from an ear... | <urn:uuid:21efea99-d648-44fd-9f91-0eb9cfa51abb> | 3.484375 | 507 | Content Listing | Science & Tech. | 45.646438 |
Flora and Fauna
Ostriches, cassowaries, emus, kiwis, and rheas.
Information about kiwi birds -- biology and conservation.
Struthio camelus, the ostrich, flightless bird native to Africa.
Business: Agriculture and Forestry: Livestock: Ratites
Shopping: Food: Meat: Exotic: Ostrich, Emu, and Rhea
Copyright © 2013 Netscape... | <urn:uuid:badc7e8e-f898-4726-8fd2-52ce9f65ad48> | 2.71875 | 115 | Content Listing | Science & Tech. | 30.876918 |
Praying mantis (insect)A praying mantis, or praying mantid, is a kind of insect, of the family Mantidae (order Dictyoptera), named for their "prayer-like" stance. (The word mantis in Greek means prophet.) There are approximately 2,000 species world-wide; most are tropical or subtropical. The most common species is Mant... | <urn:uuid:3ceead7c-69fe-4853-aa3a-f197d9c4082c> | 3.296875 | 163 | Knowledge Article | Science & Tech. | 42.341667 |
Elasmobranchii (sharks and rays) > Carcharhiniformes
(Ground sharks) > Carcharhinidae
Etymology: Carcharhinus: Greek, karcharos = sharpen + Greek, rhinos = nose (Ref. 45335).
Environment / Climate / Range
Marine; reef-associated; depth range ? - 170 m (Ref. 6871). Tropical; 34°N - 25°S
Length at first maturity / Size /... | <urn:uuid:3beaa427-85e3-4c05-9023-8fa381a1fce8> | 3.28125 | 624 | Knowledge Article | Science & Tech. | 63.964498 |
Proportion of species first reported on each foray
The fraction of species new to each foray is shown. In the second foray more than 40% of the species were new records. This is partially due to a strong seasonal effect. The genus Boletus for example is much more diverse in the December forays than the January forays, ... | <urn:uuid:4c57409c-0971-4938-ba0f-5017b7adc2e1> | 2.765625 | 133 | Structured Data | Science & Tech. | 54.404848 |
Joined: 03 Oct 2005
|Posted: Fri Dec 23, 2005 10:30 am Post subject: Scientists Develop New Process for Tracking Nanomaterials
|Scientists at Northwestern University Develop a New, Non-Invasive Process for Tracking Nanostructured Materials Inside the Body
Researchers at Northwestern University have been developing a to... | <urn:uuid:4b8a737a-9c0a-42bd-95b5-28ba99e1a405> | 3.296875 | 483 | Comment Section | Science & Tech. | 21.100999 |
Joined: 16 Mar 2004
|Posted: Mon Feb 04, 2008 12:35 pm Post subject: Golden Glue
A single gold atom might be able to serve as a versatile glue to bind together different kinds of monomers into completely unknown structures.
Pekka Pyykkö and colleagues at the University of Helsinki, Finland, have used theoretical calcul... | <urn:uuid:83368837-fd07-4e79-9110-10d2e0dfbe90> | 3.4375 | 293 | Comment Section | Science & Tech. | 27.995 |
TO TRY to understand neutron stars, researchers have abandoned telescopes for a new tool a billion billion times smallerthe nucleus of a lead atom.
Neutron stars, like the one at the heart of the Crab Nebula, have a radius of only a dozen kilometres or so but weigh more than the Sun. Despite often pumping out X-rays or... | <urn:uuid:0a35fcf8-7c62-453f-8808-e041cc05e2c9> | 4.375 | 210 | Truncated | Science & Tech. | 50.394575 |
THE over-harvesting of small fish to feed farmed salmon is threatening marine ecosystems worldwide, according to a report commissioned by respected environmental organisations. Nonsense, say industry experts, the fisheries are well managed. So who is right?
Feed for farmed fish consists of up to 80 per cent fishmeal an... | <urn:uuid:95d62df4-46f6-4467-9cca-8716942fc256> | 3 | 218 | Truncated | Science & Tech. | 51.1175 |
Color and Vision
Visit The Physics Classroom's Flickr Galleries and enjoy a photo overview of the topic of light and color.The Physics of Coloured Fireworks
Learn about the colors associated with firework displays.PhET Simulation: Neon Lights & Other Discharge Lamps
Learn how discharge lamps (e.g., neon lights) produce... | <urn:uuid:4e9abace-b7c8-409b-869a-4d2da8406916> | 4.25 | 1,570 | Content Listing | Science & Tech. | 45.631245 |
Ask the Experts; Best of Ask the Experts; Exclusive Online Issues; by Staff Editor; 1 Page(s)
The central part of the U.S. gets many tornadoes, particularly strong and violent ones, because of the unique geography of North America. The combination of the Gulf of Mexico to the south and the Rocky Mountains to the west p... | <urn:uuid:e3847505-41c8-4ead-a8b6-8fed2b7d6e9e> | 4.1875 | 266 | Truncated | Science & Tech. | 56.690275 |
Write a lexical analyser for the C programming language using the gramar for the language given in the book "The C Programming Language", 2e, by B Kernighan and D Ritchie.
Use flex for creating the lexical analyser.
Implement a desk calculator using operator precedence parsing.
Imagine the syntax of a programming langu... | <urn:uuid:1e4228ef-6f8d-48d0-9f50-fc04b001f44f> | 3.6875 | 815 | Tutorial | Software Dev. | 46.993769 |
SAN FRANCISCO, Dec. 3 (UPI) -- Russia's Far East holds seismic and volcanic hazards that could trigger tsunamis and pose a risk to the rest of the Pacific Basin, a U.S. researcher says.
Studies in the last 20 years have revealed the dangerous side of the Kamchatka Peninsula and the Kuril Islands, sources of powerful ea... | <urn:uuid:9281134b-6dd0-498f-9f26-663973c57e29> | 3.109375 | 385 | Truncated | Science & Tech. | 41.438762 |
Material and methods
Most of the type material was collected using ROV manipulators and is preserved in 75% ethanol. One specimen (CAS 175885) was originally fixed in 10% seawater formalin and later transferred to 75% ethanol. In addition to the specimens collected by ROVs, approximately twelve specimens representing o... | <urn:uuid:bdd25e88-2864-47a1-b3b7-8da40f8df65b> | 2.75 | 465 | Academic Writing | Science & Tech. | 30.136378 |
Date: ca. 1924-1928
Country of Origin: United States of America
3-D Test: 26 x 10.2cm (10 1/4 x 4 in.)
Overall, glass; wound string around part of tube over a thin cardboard underlay; each smaller tube extension with thin wire strands, apparently copper, imbedded inside each; broken off metal spring inside larger, main... | <urn:uuid:c380689b-64e6-4089-a7b8-adcbc9aa260d> | 3.515625 | 256 | Knowledge Article | Science & Tech. | 57.9415 |
|Next: Creating the License Up: Freeing the Source Previous: Freeing the Source|
The body of Communicator source code at Netscape was called ``Mozilla.'' Mozilla was a term initially created by Jamie Zawinsky and company during the development of Navigator. The team was working at a similarly frantic pace to create a b... | <urn:uuid:fd3740b7-ab55-41f0-b5b4-634f258712a6> | 2.96875 | 896 | Nonfiction Writing | Software Dev. | 47.86369 |
Melvin Prueitt of Los Alamos National Laboratory in New Mexico received patents last January for an air purifying tower for large smog- filled cities. At the top of the 650-foot tower, which would be made of metal beams covered with a fiberglass shell, a spray of fine, electrostatically charged mist would humidify the ... | <urn:uuid:10c0bc7c-0088-457e-81c3-9b3910ec9f45> | 3.0625 | 175 | Knowledge Article | Science & Tech. | 47.3825 |
Raptors are birds of prey. That mean they eat meat and many of
them like MICE. Many raptors
hunt for their meat but some look for food that is already dead!
Some raptors hunt during the day (diurnal) and others prefer the
night time (nocturnal). Raptors come in all sizes and colors
and can be found around the world in ... | <urn:uuid:35e7e7ca-afd2-4c86-9b44-04850471193d> | 4.03125 | 566 | Knowledge Article | Science & Tech. | 57.31469 |
Predict future weather using the probability that tomorrow is wet
given today is wet and the probability that tomorrow is wet given
that today is dry.
If the score is 8-8 do I have more chance of winning if the winner
is the first to reach 9 points or the first to reach 10 points?
It is believed that weaker snooker pla... | <urn:uuid:5cab8824-4109-4de4-89e5-d8c1df520c04> | 2.875 | 108 | Q&A Forum | Science & Tech. | 70.107257 |
Four vehicles travelled on a road with constant velocities. The car
overtook the scooter at 12 o'clock, then met the bike at 14.00 and
the motorcycle at 16.00. The motorcycle met the scooter at 17.00
then it overtook the bike at 18.00. At what time did the bike and
the scooter meet?
Brian swims at twice the speed that ... | <urn:uuid:525d1cbd-ccb0-4584-b9b7-c181d9b8e31a> | 2.921875 | 383 | Q&A Forum | Science & Tech. | 80.12169 |
Copyright © University of Cambridge. All rights reserved.
We had just a few solutions sent in from pupils trying to give some kind of proof for this challenge. Jasmine from Salcombe Prep. School in London sent in this picture and wrote:
Every time the numbers will make a rectangle
and from Michelle at the International... | <urn:uuid:11ba6a28-dfd7-4f6c-a689-4be3ca9da20f> | 3.3125 | 286 | Comment Section | Science & Tech. | 59.947011 |
This is the uncommon time a beautiful spectrum and chaotic climate reasoning came go to go creating a gorgeous world high in the sky.
As the creature climate began to control the air over Co, USA, most individuals would have been securing their windows and doors.
But as the risk declined one fortunate group of climate ... | <urn:uuid:990acde8-b0cf-405e-9caf-a0dad37e3f3c> | 2.84375 | 649 | Truncated | Science & Tech. | 48.885781 |
Ocean Circulation and Upwelling Visualizations
Find images and animations about ocean surface currents, upwellings and circulation models.
Browse the complete set of Visualization Collections.
If you have a visualization that would be helpful for teaching about earth science, please contribute to our continually expand... | <urn:uuid:dc4b9edf-c893-4e03-975c-3408cc3197c0> | 3.375 | 290 | Content Listing | Science & Tech. | 21.090896 |
Mission Type: Orbiter
Launch Vehicle: Thor-Delta E-1 (no. 50 / Thor no. 488 / DSV-3E)
Launch Site: Eastern Test Range / launch complex 17B, Cape Canaveral, USA
NASA Center: Goddard Space Flight Center
Spacecraft Mass: 104.3 kg at launch
Spacecraft Instruments: 1) magnetometers; 2) thermal ion detector; 3) ion chambers ... | <urn:uuid:f2ff6996-4e59-42fc-8a43-6f492a286d26> | 3.46875 | 372 | Knowledge Article | Science & Tech. | 51.94557 |
The Blue Morpho Butterfly is a beautiful brown — yes, brown — butterfly. The microscopic scales on this rainforest butterfly manipulate light, reflecting back an intense blue light that makes them appear blue.
Showing 8 posts tagged butterflies
Professor Brian Cox explains how Monarch Butterflies navigate by “monitorin... | <urn:uuid:a53aec48-0262-4d48-bc1e-0e10aa33152f> | 2.90625 | 588 | Content Listing | Science & Tech. | 45.651218 |
One of the great things about Bach’s organ music is how changes of a single note in a whole pattern can have rather dramatic effects on the sound. A unique and potentially very important similar phenomenon has been discovered recently in the area of GPCR research.
The understanding of the basic process by which GPCRs t... | <urn:uuid:87023f86-2836-41b9-875f-b7e1a49bbf26> | 3.046875 | 1,347 | Nonfiction Writing | Science & Tech. | 30.834403 |
Task Summary Reports
This project began by digitizing all hand-written meteorological observing
records from the pre-1948 era yielding a database totaling 370 stations
with some records dating back to the 1850's. This database was merged
with the post-1948 observations and stored using the Summary of the
Day (SOD) form... | <urn:uuid:92d3fd06-2f59-44da-97a5-7b6e13795eb9> | 2.6875 | 292 | Knowledge Article | Science & Tech. | 23.866865 |
filesystem, formerly known as
, is a filesystem
keeping all files in virtual memory.
Everything in tmpfs is temporary in the sense that no files will be
created on any device. If you unmount a tmpfs instance,
everything stored therein is lost.
tmpfs puts everything into the kernel internal caches and grows and
shrinks ... | <urn:uuid:85c2105f-16d1-448f-97b9-a0e8fb057083> | 2.921875 | 702 | Documentation | Software Dev. | 63.256209 |
The SRES emissions scenarios also have different emissions for other GHGs and chemically active species such as CO, NOx , and volatile organic compounds. The uncertainties that surround the emissions sources of these gases, and the more complex set of driving forces behind them are considerable and unresolved. Hence, m... | <urn:uuid:d0231547-3bde-4a43-be57-f4a6d842d65a> | 3.171875 | 1,067 | Academic Writing | Science & Tech. | 35.178948 |
<!DOCTYPE> is a special tag which is declared in the very beginning of a web page before <html> tag. It sends an instruction to the web browser about the version of HTML. <!DOCTYPE> is not a HTML tag and most of the modern browsers support this tag declaration. As HTML5 is not based on SGML, so no DTD reference is requ... | <urn:uuid:1a653711-2335-4566-b79d-7d42c9a3b973> | 3.4375 | 181 | Documentation | Software Dev. | 64.737134 |
IF YOU bury it deep enough, high-level radioactive waste will seal itself into the rock and can be safely forgotten. So claims one geochemist, who believes he has the answer to a growing global problem.
The world's nuclear plants have accumulated vast stocks of highly radioactive waste. By 2010, Britain alone could hav... | <urn:uuid:4655fd01-98c7-4a71-8e8a-e5ea6c12fd52> | 3.78125 | 214 | Truncated | Science & Tech. | 43.984098 |
How much do scientists know about our solar system? Out of 8 planets, is ours really the only one to sustain life? How can meteorites tell us about other planets, and even how the solar system first began? Explore our universe with the help of the Museum, and discover the role the Museum plays in space exploration and ... | <urn:uuid:68ab5b5b-4034-4464-ab09-aca6a139dc32> | 3.75 | 315 | Content Listing | Science & Tech. | 57.109655 |
Future Fuels: Sparks? Soy?
By KRISTEN STERNBERG | NIE Educational Consultant
The Earth's population continues to grow, and more people mean more development, more food production, more industry and more travel, for a start. All these activities-and many others-require fuel. What if the world ran out of fuel?
Fuel isn't... | <urn:uuid:b7fd7531-868a-4bbe-8239-f96fb4ea5bed> | 3.75 | 2,699 | Knowledge Article | Science & Tech. | 74.301413 |
Herd in a Hot Spot
Alaska's Porcupine caribou face an uncertain future as global warming alters their fragile Arctic habitat
Lisa W. Drew
FOR THE PAST five years, no one has been able to count the members of the most well-known caribou herd on Earth. Every time scientists have flown over Alaska's Arctic National Wildli... | <urn:uuid:64bc465d-f05d-4bf4-837f-80c8f7764b3b> | 3.578125 | 2,658 | Content Listing | Science & Tech. | 48.635958 |
Acid Test: The Global Challenge of Ocean AcidificationAcid Test: The Global Challenge of Ocean Acidification
Watch on YouTube
Ocean acidification: Connecting science, industry, policy and publicOcean acidification: Connecting science, industry, policy and public
Watch on YouTube
About this video
Not just another pretty... | <urn:uuid:28366f1d-93b0-46c7-bb3c-10e8238d73ac> | 3.328125 | 641 | Truncated | Science & Tech. | 46.146582 |
In this study, the classical and modern signal processing
methods are used to extract dominant frequencies of Masjed Soleiman dam,
the highest embankment dam in Iran. The signals were recorded in the gallery,
mid-height and the crest of the dam during local earthquakes. Since the
amplitude and frequency contents of ear... | <urn:uuid:ecb05483-be37-4362-9c11-3bf7a79b1877> | 2.875 | 327 | Academic Writing | Science & Tech. | 31.765588 |
How do human CO2 emissions compare to natural CO2 emissions?
What the science says...
|Select a level...||Basic||Intermediate|
|The natural cycle adds and removes CO2 to keep a balance; humans add extra CO2 without removing any.|
Before the industrial revolution, the CO2 content in the air remained quite steady for tho... | <urn:uuid:f6417edc-0672-4da9-957c-128cdba9f48f> | 3.796875 | 453 | Truncated | Science & Tech. | 53.695734 |
An experimental investigation is conducted to determine the feasibility of laboratory simulation of the interaction of the shock wave of a hypersonic body with a separate moving shock wave. The experimental technique uses a blunted cone mounted in a hypersonic wind tunnel to generate the body shock wave. Shock tubes ar... | <urn:uuid:a2b4dc92-09f0-44b0-9dec-d986a3a9e65d> | 2.796875 | 306 | Truncated | Science & Tech. | 38.710202 |
In this chapter we'll discuss the technology involved in developing mobile applications with the Flash Platform. We'll explore ActionScript, the AIR runtime, and the Flex framework, as well as various best practices for optimizing applications that are to be used on smartphones and tablets.
Developing for the Flash Pla... | <urn:uuid:1353b35c-d5e1-43eb-935e-8c7874da07bf> | 2.90625 | 2,854 | Tutorial | Software Dev. | 42.969098 |
The copy() function copies a file.
This function returns TRUE on success and FALSE on failure.
|file||Required. Specifies the file to copy|
|to_file||Required. Specifies the file to copy to|
Note: If the destination file already exists, it will be overwritten.
The output of the code above will be:
Your message has been... | <urn:uuid:bede87cc-ceb3-4fb3-a2f9-81a88aa89393> | 2.71875 | 87 | Documentation | Software Dev. | 50.255658 |
Hydrogen is an almost perfect energy source. It combines with oxygen to produce energy and water with no greenhouse gases. The problem is, hydrogen rarely occurs by itself in nature. There are basically two ways to produce usable hydrogen - through steam reforming or electrolysis.
The chemical equation for steam reform... | <urn:uuid:3f36e176-8423-4929-b5f6-3c0b07f672c9> | 3.96875 | 304 | Personal Blog | Science & Tech. | 23.433557 |
Drought Tolerance in Two Perennial Bunchgrasses Used for Restoration in the Intermountain West, USA
An ideal restoration species for the semi-arid Intermountain West, USA would be one that grows rapidly when resources are abundant in the spring, yet tolerates summer’s drought. We compared two perennial C3, Triticeae In... | <urn:uuid:d9776f4a-9709-4be1-84c2-b236c617d731> | 2.921875 | 421 | Academic Writing | Science & Tech. | 43.733283 |
In a counter-intuitive finding these snakes have been found, in certain specific ecosystems to not suffer any apparent detriment despite having lost eyes to attacks from Silver Gulls ( Larus novaehollandiae ).
- Bonnet, X., Bradshaw, D., Shine, R., & Pearson, D. (1999). Why do snakes have eyes? The (non-)effect of blin... | <urn:uuid:ca6e6ac1-2eaa-4828-98cd-12781b535da9> | 3.484375 | 127 | Knowledge Article | Science & Tech. | 60.531143 |
Russell McMahon email (remove spam text)
> Not to be contrary, Russell,
Contraryness is always welcome :-)
But I can be happy with non-contraryness too.
> but the data seems to be very compelling for
> some and hardly impressive for others within the community of scientists.
> This is not the case for gravity, or elect... | <urn:uuid:89442a3e-4e7f-46dc-8c52-a9dad54a06dd> | 2.875 | 728 | Comment Section | Science & Tech. | 62.977959 |
The chain graph shown above has only one centre, $d$. The largest distance from $d$ to any other vertex is $3$, from $d$ to $a$ and from $d$ to $g$. The largest distance from $c$ to any other vertex is $4$, to vertex $g$, which is greater than $3$, so $c$ is not a centre. Similarly, the greatest distance from $e$ to an... | <urn:uuid:f5a22802-d22f-4a94-93bc-9206e6090779> | 3.140625 | 350 | Q&A Forum | Science & Tech. | 79.747917 |
Every insect looks prettier when it lands on a tower of jewels (Echiium wildpretti).
When in full bloom, the 9-to-10-foot-high plant, native to the Canary Islands, blazes with firecracker-red flowers. It's a showstopper.
Syrphid flies, aka flower flies or hover flies, battle with honey bees to sip the sweet nectar.
The... | <urn:uuid:8a37598f-7d7c-4752-8aa5-ea15ea127b61> | 2.703125 | 1,085 | Personal Blog | Science & Tech. | 60.343183 |
Simply begin typing or use the editing tools above to add to this article.
Once you are finished and click submit, your modifications will be sent to our editors for review.
...becomes a new double helix with a new complementary strand to replace the original one. Because adenine always falls in place opposite thymine ... | <urn:uuid:12954f49-77f0-4043-9e43-b5cb720077a3> | 4.0625 | 313 | Truncated | Science & Tech. | 49.370946 |
We will define a random-access machine as follows:
Data types. The only data type we will support is the natural numbers 0, 1, 2, 3, .... (However, numbers may be arbitrarily large.)
Variables. We will allow an arbitrary number of variables, each capable of holding a single natural number. All variables will be initial... | <urn:uuid:e0d0c713-08bc-4dfc-a0f3-e343b884cf05> | 3.9375 | 301 | Documentation | Software Dev. | 43.298351 |
So, without further ado, I present to you digital root extraction.
Step 1: What is a Digital Root?
A better demonstration would be to take a number (such as 179) and demonstrate. So, the digital root of 179 is something like this:
179 -> 1+7+9 = 17 -> 1+7 = 8
So, the digital root of 179 is 8.
Another, more interesting ... | <urn:uuid:a0811838-f114-49a5-9d4c-2b24d6bd5816> | 2.75 | 160 | Tutorial | Science & Tech. | 75.678155 |
If you leave the IP address for your new site as All Unassigned, your
new site will be the default web site for your computer, which is the
web site the server returns when a browser tries to access an IP
address not currently assigned to another site. For example, if a
computer has three IP addresses--172.16.12.50, 17... | <urn:uuid:faa9133b-693b-47da-87cb-ef5465b58e48> | 2.703125 | 1,152 | Documentation | Software Dev. | 62.745567 |
This section explains some of the rationale and technical details behind the overall build method. It is not essential to immediately understand everything in this section. Most of this information will be clearer after performing an actual build. This section can be referred to at any time during the process.
The over... | <urn:uuid:62d09ee4-9376-4476-b34c-750d7c7278e8> | 3.625 | 1,566 | Documentation | Software Dev. | 53.08112 |
Planning your app is the most important phase of developing a great app. This could make or break your project. If you are going to be a serious iPhone Developer and play with the big kids, you have to have some kind of strategy to building your mobile app.
In the old days of programming, a systematic approach was used... | <urn:uuid:374b9e20-d6b3-43f6-9398-c7880551f833> | 3.015625 | 218 | Tutorial | Software Dev. | 55.835643 |
Compared to other species, little is known of M. javanica reproduction.
They usually give birth to one young, occasionally two. The scales are soft at birth but harden on the second day (Nowak, 1999). Births are thought to occur during February to March or August to October (Banks, 1949).
Young cling to base of mother’... | <urn:uuid:93cb02d2-5434-4bf9-af94-45386d23328c> | 3.40625 | 120 | Knowledge Article | Science & Tech. | 67.825 |
Whether you are interested in insects, birds, reptiles or amphibians, find out how you can help the UK's experts to map the biodiversity of the UK.
As well as the surveys that the Museum runs, there are many other national wildlife surveys happening all over the UK. Here are some examples that you can take part in. We ... | <urn:uuid:81ff6dfa-3f3a-4c11-8342-18bfbcf69782> | 3.640625 | 863 | Content Listing | Science & Tech. | 51.4271 |
Next presentation offering
To be determined
In December 2011 the North Museum of Natural History & Science began presenting its newest demonstration attraction.
It's a circular track of magnets above which a razor-thin disc amazingly levitates, seeming to defy the laws of physics.
Purchased for about $7,000 from Tel-Av... | <urn:uuid:8a07efac-fcb3-4ea7-8319-cf8630efd879> | 3.828125 | 298 | Knowledge Article | Science & Tech. | 41.606923 |
Concurrency: An Introduction
Thus far, we have seen the development of the basic abstractions
that the OS performs. We have seen how to take a single phys-
ical CPU and turn it into multiple virtual CPUs, thus enabling
the illusion of multiple programs running at the same time. We
have also seen how to create the illus... | <urn:uuid:d262e6c3-c1c8-4d0a-9f71-053be0949a72> | 3.5 | 262 | Academic Writing | Software Dev. | 49.016768 |
By Geoff Brumfiel of Nature magazine
Without fanfare, astronomers have redefined one of the most important distances in the Solar System. The astronomical unit (au) — the rough distance from the Earth to the Sun — has been transformed from a confusing calculation into a single number. The new standard, adopted in Augus... | <urn:uuid:0dcb01fd-492d-4d07-bc20-1aa7351e9405> | 3.78125 | 808 | Truncated | Science & Tech. | 39.907604 |
More In This Article
- Photo Album
In the February issue of Scientific American two astrophysicists offer a close-up look at a telescope they are developing for NASA. The Nuclear Spectroscopic Telescope Array (NuSTAR) is the space agency's first mission capable of focusing high-energy x-rays. Among other goals, NuSTAR ... | <urn:uuid:16a39d3a-93a0-4aa8-a1c0-aa64a73e2e7e> | 3.171875 | 130 | Truncated | Science & Tech. | 27.105536 |
|Date sent: Tue,
21 Jul 1998
John Shaw <John.Shaw@ualberta.ca>
Here are my responses to your comments.
How did melting occur under an ice sheet?
Melting at a glacier bed is a result of several energy sources:
i) Geothermal heat conducted from the Earth's interior;
ii) Frictional heat generated by sliding at the ice bed... | <urn:uuid:34963e68-9704-4d88-8790-a0ad2fa5a591> | 4.15625 | 973 | Comment Section | Science & Tech. | 48.251775 |
by Staff Writers
Pasadena CA (JPL) Jan 19, 2012
La Nina, "the diva of drought," is peaking, increasing the odds that the Pacific Northwest will have more stormy weather this winter and spring, while the southwestern and southern United States will be dry.
Sea surface height data from NASA's Jason-1 and -2 satellites sh... | <urn:uuid:402e5cb0-df74-4c1e-abf2-f092e39daef8> | 3.109375 | 835 | Truncated | Science & Tech. | 38.120739 |
It's rare for a month to go by without some aspect of DNA sequencing making the headlines. Species after species has seen its genome completed, and the human genome, whether it's from healthy individuals or cancer cells, has received special attention. A dozen or more companies are attempting to bring new sequencing te... | <urn:uuid:8556733b-8d37-439b-8492-dea89a3c5451> | 4.0625 | 2,224 | Truncated | Science & Tech. | 44.709854 |
There is a buzz of excitement around citizen science currently. At its best citizen science can allow excellent engagement of people with science and nature, and it can be real science.
Last week, scientists at the NERC Centre for Ecology & Hydrology (CEH) and Natural History Museum published a review of citizen scienc... | <urn:uuid:de5d6764-b069-4166-a0aa-dfe98c02b73e> | 2.921875 | 729 | Personal Blog | Science & Tech. | 32.790324 |
Charm++ is a portable adaptive runtime system for parallel applications. Application developers create an object-based decomposition of the problem of interest, and the runtime system manages issues of communication, mapping, load balancing, fault tolerance, and more. Sequential code implementing the methods of these p... | <urn:uuid:258ad0f4-e52a-4cf2-94c5-2f69f7f09b25> | 2.8125 | 352 | Knowledge Article | Software Dev. | 52.005 |
Even if you don’t know the story or significance behind this simple animation, you have probably seen it before. The legend goes that during the 1870′s, English photographer Eadward Muybridge was commissioned by Leland Stanford, a former governor of California and horse enthusiast, to prove that in the course of a hors... | <urn:uuid:ab1d4c79-2f18-4385-9091-835b4cfcbe1d> | 3.34375 | 1,186 | Personal Blog | Science & Tech. | 38.022971 |
|Jolitz Heritage ]||
One of the last considerations in the development of the 386BSD specification is deciding how we can most easily bootstrap load the BSD kernel from hard or floppy disk. We know that ISA machines have BIOS ROMs that select the device to be booted (typically the floppy first, followed by the hard dis... | <urn:uuid:0323873f-b781-496f-8635-20303c85bb98> | 3.03125 | 550 | Documentation | Software Dev. | 51.016357 |
Birds and Rattle Snake
Name: Ann T.
Date: Tuesday, August 06, 2002
Hello, I live in the foothills of the Sierra Nevada.
This area is basically dry fields in the summer. I have had many
rattlesnakes this year. I have had two experiences with the local song
birds, in a sense, warning me that there was a rattlesnake about... | <urn:uuid:8f8cee02-365a-4dad-9ab6-f594764223de> | 2.6875 | 244 | Q&A Forum | Science & Tech. | 59.54069 |
Above, today’s NEXSAT satellite image over New York City from Navy Satellite. So, there’s this obscuration, plus the CARE Rocket.
Here is more information on today’s experiment. HAARP and other antenna arrays are being used, I see Norway’s antenna array will be in operation. This information was forwarded to me from Ca... | <urn:uuid:c351b9c8-2e41-4e77-a394-0336a28fa08b> | 3.109375 | 614 | Personal Blog | Science & Tech. | 31.683726 |
I’ve been learning Python for about a week now using Learn Python the Hard Way. It isn’t that hard for me yet since I have a strong SysAdmin background. So it comes somewhat natural for me.
LPTHW is not the best resource for a beginner but it’s a great start nonetheless. Previously, I haven’t written any code beyond He... | <urn:uuid:d24c293a-5d64-4353-88a1-c26293ba003e> | 2.9375 | 339 | Personal Blog | Software Dev. | 69.836717 |
Many deep sea animals have the amazing ability to glow in the dark by using bioluminescence. Learn how bioluminescence works, and how animals use this adaptation.
How Bioluminescence Works
Bioluminescence is mainly found in marine organisms living in the ocean’s deepest regions. It is rare in freshwater species or in t... | <urn:uuid:e98380c7-4ab5-4f0a-b265-be59f57e6a0f> | 4.25 | 478 | Knowledge Article | Science & Tech. | 29.586471 |
April 25, 2011
Dust in an astronomical context refers to small grains of solid material present in space. These grains form in the winds of evolved stars and supernovae explosions.
Era Carinae shed some 2 to 3 solar masses of gas and dust nearly 160 years ago to create the lobed nebula surrounding the massive star. Thi... | <urn:uuid:1307d8f3-f1cc-41f9-8084-9620b0a3e7ba> | 3.421875 | 256 | Truncated | Science & Tech. | 46.6275 |
Trends in Plant Science, Volume 5, Issue 11, 1 November 2000, Pages 482-488
Robert B. Jackson, John S. Sperry and Todd E. Dawson
Plant water loss, regulated by stomata and driven by atmospheric demand, cannot exceed the maximum steady-state supply through roots. Just as an electric circuit breaks when carrying excess c... | <urn:uuid:d67e2a9a-e466-4ecb-b5a7-e375cc32ff8b> | 2.6875 | 730 | Content Listing | Science & Tech. | 34.369568 |
Hyperphysics: Torque Feature Summary
- Physics in Your World
- Think about the forces on this sailboat: The force of the wind on the sail (perpendicular to the fabric of the sail), tends to rotate the boat. A force that can rotate an object is called a torque. In this case, if the torque of the wind isn't balanced, it ... | <urn:uuid:fdfcbcaa-1947-4b1a-993f-b46b190b8084> | 3.375 | 173 | Knowledge Article | Science & Tech. | 54.763 |
Hawaii Researchers Explore Previously Unseen Coral
Source: The Associated Press
September 8, 2009
Honolulu - Scientists over the past month explored coral reefs in the remote Northwestern Hawaiian Islands that until recently were considered too deep for scuba divers to reach.
Divers swam among previously unseen reefs a... | <urn:uuid:ba653ac4-6f35-430e-bc3a-44251ef56076> | 2.890625 | 134 | Truncated | Science & Tech. | 31.628571 |
Prescribed Fire in Alabama
Prescribed fire is a safe way to apply a natural process that benefits various habitats and ensures ecosystem health. Wildlife habitat and animals such as deer, turkeys, and quail flourish in areas that are maintained with prescribed fire. Some rare animals such as the red-cockaded woodpecker... | <urn:uuid:a283e003-9876-4415-b540-29d23cce4520> | 3.515625 | 287 | Knowledge Article | Science & Tech. | 23.770148 |
The Venus Transit 2004
... Extended InfoSheet D7
The clouds of Venus - a description of the planet's atmosphere
One of the reasons why Venus looks like a jewel in the sky is that this sister planet of the Earth is covered by a dense cloudy atmosphere which causes its high visual albedo of 0.65. But this cloudy shell al... | <urn:uuid:b4f49cb4-f8eb-4d5f-944a-b32cd562fa67> | 4.03125 | 1,259 | Knowledge Article | Science & Tech. | 45.172553 |
O'Reilly Book Excerpts: Programming Visual Basic .NET
ADO.NET, Part 3
This is the third installment from the Programming Visual Basic .NET chapter on ADO.NET, focusing on the relations between DataTables in a DataSet, and the DataSets XML capabilities.
Relations Between DataTables in a DataSet
The DataSet class provide... | <urn:uuid:c96ed465-af9e-4b01-8cd5-744f7a5a8b2a> | 2.6875 | 726 | Documentation | Software Dev. | 42.343686 |
More and more people around the world are becoming aware of the environmental issues surrounding plastic bags. Considering their somewhat placid appearance, the impact of plastic bags on the environment can be devastating.
Here are some facts about the environmental impact of plastic bags:
- Plastic bags cause over 100... | <urn:uuid:22a517ac-920e-4d73-9112-d88f85f67c31> | 3.390625 | 326 | Personal Blog | Science & Tech. | 42.609027 |
DELICATE quantum bits have been stored in single atoms, a feat that could make accessing memory in quantum computersmore convenient.
Unlike classical bits, which can store only a 0 or 1, qubits can be in a superposition of the two states at once. Two or more can also be "entangled" and remain linked across great distan... | <urn:uuid:c68892b1-0b05-43fa-b24e-3280018dd4ce> | 3.953125 | 196 | Truncated | Science & Tech. | 46.740802 |
Coding Languages, Compilers Category
With a little bit of luck, find proper tools that would help every beginner to quickly get used to the basics of programming or find simple to use programming languages powerful enough to let you write useful programs quickly. Learn the purposes every programming language has and di... | <urn:uuid:cdede2b8-7a44-4e4a-b590-23a3b40cd98c> | 2.703125 | 180 | Content Listing | Software Dev. | 27.214073 |
|It is important that the vegetation surrounding each trap is
recorded in a manner which allows distance weighted abundance to be calculated
for each plant taxon. It is recommended that this is done in two stages, one,
in the field and the second using digitised maps, air photos or forest
|Pollen deposited in the traps... | <urn:uuid:036a314d-3c14-46ac-832c-48938a4785c3> | 3.796875 | 2,172 | Tutorial | Science & Tech. | 48.204799 |
Author: This chapter originated as part of Enhancement of the ANSI SQL Implementation of PostgreSQL, Stefan Simkovics' Master's Thesis prepared at Vienna University of Technology under the direction of O.Univ.Prof.Dr. Georg Gottlob and Univ.Ass. Mag. Katrin Seyr.
This chapter gives an overview of the internal structure... | <urn:uuid:7d68951a-d352-4d04-bd00-f139b343ae3f> | 2.796875 | 169 | Truncated | Software Dev. | 51.097283 |
It has now become all too common. Peculiar weather precipitates immediate blame on global warming by some, and equally immediate pronouncements by others (curiously, quite often the National Oceanic and Atmospheric Administration in recent years) that global warming can’t possibly be to blame. The reality, as we’ve oft... | <urn:uuid:341940a1-09bf-4e10-8ce6-3d50dfbc392d> | 2.9375 | 1,383 | Nonfiction Writing | Science & Tech. | 36.700943 |
Flora Fact: Multiplying Mangroves
Rising warmth and salinity increase black mangrove numbers.
By Sheryl Smith-Rodgers
Whenever he’s out collecting data, Eric Madrid often hears old-timers describe how favorite fishing spots along the Texas Gulf Coast have changed.
“They tell me that black mangrove are everywhere now, a... | <urn:uuid:1012c601-fa75-4d8e-acb4-d8a15ef498c6> | 3.84375 | 401 | Truncated | Science & Tech. | 43.475564 |
run-parts runs a number of scripts or programs found in a single directory directory. Filenames should consist entirely of upper and lower case letters, digits, underscores, and hyphens. Subdirectories of directory and files with other names will be silently ignored.
Scripts must follow the #!/bin/interpretername conve... | <urn:uuid:e38cc8df-0295-47f7-baee-8c60e37323a5> | 2.765625 | 321 | Documentation | Software Dev. | 64.013004 |
Given my blog title, how have I gone this long without discussing triangle geometry? I will rectify this gross negligence in the next few weeks. Let’s begin with a seemingly impossible fact due to Frank Morley.
Start with a triangle ABC, with any shape you wish. Now cut its angles into three equal parts, and extend the... | <urn:uuid:b4903fd2-71c9-4c47-8f14-653c6f0cdde1> | 2.796875 | 578 | Personal Blog | Science & Tech. | 57.041571 |
We all know that the area of a circle is and the volume of a sphere is , but what about the volumes (or hypervolumes) of balls of higher dimension?
For a fun exercise I had my multivariable calculus class compute the volumes of various balls using multiple integrals. The surprising results inspired this post.
First som... | <urn:uuid:63aa6e84-ff0e-418f-b01d-02750fc070fd> | 3.5 | 901 | Personal Blog | Science & Tech. | 55.606465 |
Alongside Planck's constant and the speed of light in a vacuum, the gravitational constant, G, is one of the most important and fundamental constants in our universe. However, since Isaac Newton introduced it in 1686, the value of G has been always been a little controversial. Despite centuries of physicists working on... | <urn:uuid:1a90866d-99b2-4ee9-99ff-77da654bb569> | 4.15625 | 734 | Knowledge Article | Science & Tech. | 45.152153 |
There are 1760 yards in a mile. A certain wheel makes 17,600 revolutions in 40 miles. What is the number of yards in the radius of the wheel? Give your answer as a decimal to the nearest tenth of a mile.
Follow Math Help Forum on Facebook and Google+
the wheel travels a distance of in one revolution, so that would mean... | <urn:uuid:c524557c-c33e-4ada-b104-92a6a86d322a> | 2.8125 | 153 | Q&A Forum | Science & Tech. | 78.006071 |
Science Sunday: The Reason for the Season
As I’m writing this it’s late evening, and I have been spending a few days at home. Funny thing is, even though I’m going to bed soon, the Sun isn’t setting. Actually, it won’t set for at least another month. During that time, it will circle the sky, dip a bit up and down, but ... | <urn:uuid:7126d38a-e966-4c5c-addd-71470d72ad14> | 3.421875 | 774 | Personal Blog | Science & Tech. | 55.823125 |