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 |
|---|---|---|---|---|---|---|
This is an image of the surface of Io.
Click on image for full size
Can there be Life in the Environment of Io?
In spite of the fact that Io has an atmosphere, the environment of Io seems pretty unfriendly toward life as we know it
Io is very small, so there is not much gravity. For this reason, the atmosphere of Io is... | <urn:uuid:02e394b4-f0c3-4110-8b8a-89d2995b8116> | 3.34375 | 604 | Content Listing | Science & Tech. | 54.294398 |
The strfmon() function formats the specified amounts according to the format specification format and places the result in the character array s of size max.
Ordinary characters in format are copied to s without conversion. Conversion specifiers are introduced by a `%' character. Immediately following it there can be z... | <urn:uuid:9cfc027a-d81b-4a36-ad59-bb7f969a168e> | 3.375 | 391 | Documentation | Software Dev. | 46.384671 |
By Matin Durrani, Editor, Physics World
The Royal Society — perhaps the world’s oldest and most prestigious scientific society — is celebrating its 350th anniversary this year. It was founded in 1650 by a group of 12 natural philosophers, including Robert Boyle, best known for his law describing how the pressure of a g... | <urn:uuid:1ef53030-21a4-4043-9156-8b31d1e92578> | 2.703125 | 579 | Truncated | Science & Tech. | 36.802979 |
Glowing Remnant from a Star-Shattering Explosion
This "true color" Chandra image of N132D shows the beautiful, complex remnant of an explosion of a massive star in the Large Magellanic Cloud, a nearby galaxy about 160,000 light years from Earth. The colors represent different ranges of X-rays, with red, green, and blue... | <urn:uuid:d1a7dd89-5a2a-478f-9557-8a030b6ebc77> | 3.28125 | 174 | Knowledge Article | Science & Tech. | 47.350529 |
We mentioned a recent paper that examined silicon/carbon fibers for use in batteries. Shown above is a TEM image from the paper. From it you can tell the fibers are essentially hollow carbon fibers with a layer of silicon around the outside edge.
Transmission electron microscopes (TEMs) work by shooting a beam of elect... | <urn:uuid:6d86496c-53c1-4080-8a94-89e00c16c845> | 3.640625 | 240 | Personal Blog | Science & Tech. | 44.574091 |
This section describes how to use mysqldump to produce dump files, and how to reload dump files. A dump file can be used in several ways:
As a backup to enable data recovery in case of data loss.
As a source of data for setting up replication slaves.
As a source of data for experimentation:
To make a copy of a database... | <urn:uuid:182834a8-1fd0-4088-9d77-9703ea2a3ee7> | 3.390625 | 252 | Documentation | Software Dev. | 45.133333 |
See also the
Dr. Math FAQ:
See also the
Browse High School Trigonometry
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Volume of a tank.
- Averaging Two Angles [06/08/1999]
How do you take the average of two or more angles?
- Basics of Trigonometr... | <urn:uuid:bd822fd3-b498-428e-b51b-5393a8c8e832> | 3.3125 | 1,815 | Q&A Forum | Science & Tech. | 77.8179 |
Well, security should be no different. To build secure mobile apps, there are certain things that we're just going to have to do, and darn near every single time we write code.
So, what security goodies are in your bag of tricks? Here's some food for thought on some things you might find useful, in no particular order:... | <urn:uuid:590363e6-f889-495a-b13b-ce314fc182f5> | 2.84375 | 751 | Personal Blog | Software Dev. | 48.645908 |
The XmlLite library allows developers to build high-performance XML-based applications that provide a high degree of interoperability with other applications that adhere to the XML 1.0 standard. The primary goals of XmlLite are ease of use, performance, and standards compliance.
XmlLite works with any Windows language ... | <urn:uuid:afc1de8a-e57a-4e74-bc10-8eb3635d863f> | 2.734375 | 1,067 | Documentation | Software Dev. | 44.147531 |
I’m tickled to see that my work on stonefly flight has come up in this discussion. One thing that is worth adding here is that a gills-to-wings transition would require a simultaneous change in gas exchange, since a sophisticated wing is unlikely to also be an effective gill, and the physics and physiology of gas excha... | <urn:uuid:eb4046fd-5a95-4d7b-918b-bed39cfc7831> | 2.703125 | 676 | Personal Blog | Science & Tech. | 55.837475 |
The Mg/Ca in foraminifera shells is commonly used as a proxy to estimate ocean temperatures in Earth’s past. However, studies have shown that both dissolution and salinity influence the Mg/Ca in shells of tropical foraminifera, which can cause paleotemperature estimates to be inaccurate. We measured Mg/Ca in shells of ... | <urn:uuid:4c233e43-b19a-4654-80b1-468c074b7642> | 2.84375 | 260 | Academic Writing | Science & Tech. | 27.516287 |
SWAN Lyman-alpha whole sky map in ecliptic coordinates. Two areas were not covered for safety reasons, around the Sun and around the anti-solar direction. The color is coding the intensity, in counts per second per pixel (one square degree), which corresponds to 1.3 Rayleigh. A number of UV hot stars can be identified,... | <urn:uuid:b956fdde-dd35-4ddc-b697-985dfd032fc2> | 3.078125 | 240 | Knowledge Article | Science & Tech. | 43.645949 |
Advance in science comes by laying brick upon brick, not by sudden
erection of fairy palaces.
- J. S. Huxley
Astronomers refer to Venus as Earth's sister planet. Both are similar in size, mass, density and volume. Both formed about the same time and condensed out of the same nebula. However, during the last few years s... | <urn:uuid:bcaa0314-ca1b-470f-ac88-d2841847fb8c> | 4.28125 | 3,719 | Knowledge Article | Science & Tech. | 52.345557 |
Unitary transformations are like orthogonal transformations, except we’re working with a complex inner product space. We’ll focus on just the transformations that are unitary with respect to the inner product itself. That is, we ask that
and so we must have just as we wrote for orthogonal transformations, but we have t... | <urn:uuid:e781c5a3-8505-4486-8c3c-7276e1377f94> | 3 | 322 | Personal Blog | Science & Tech. | 42.795 |
2012 SURF: Evolution of Fruit Fly Wings
Selection to Change the Wings in Drosophila
The goal of this project is to carry out controlled selective breeding on wings in fruit flies (Drosophila melanogaster) so that we can shed light on the genetics of evolution. Fly wings are slightly different in closely related species... | <urn:uuid:aa1876c2-122f-485f-ba0b-2c02959661e7> | 3.046875 | 184 | Academic Writing | Science & Tech. | 28.952895 |
The breeding population of chinstrap penguins has declined significantly as temperatures have rapidly warmed on the Antarctic Peninsula, according to researchers funded in part by the National Science Foundation (NSF).
The study indicates that changing climatic conditions, rather than the impact of tourism, have had th... | <urn:uuid:2afa46c6-6c9a-46b2-9aa6-09ee5e55a4e5> | 3.0625 | 394 | Knowledge Article | Science & Tech. | 31.323284 |
What is meant by first contact?
Basically it's the start of the eclipse. The point where the eclipsing body first touches the primary star's image and starts a decrease in the primary star's brightness as seen from Earth. But it's not so simple. With epsilon Aurigae, first contact appears to be wavelength dependent. Th... | <urn:uuid:e4110162-b091-43d5-80da-0140bf3f775d> | 3.5625 | 450 | Knowledge Article | Science & Tech. | 54.391179 |
On our second afternoon at Woleai, I had the opportunity to deploy my drifter. I went out to the reef in one of the small boats that we use to move from the big ship, anchored in deep water, to the shallow reef area, near the shore.
To begin, I looked around to observe the water movement, and I jumped in the water to f... | <urn:uuid:789e4c67-d683-4277-a157-b2e80aefe6e7> | 2.828125 | 322 | Personal Blog | Science & Tech. | 48.006043 |
COLLEGE STATION, Texas, Oct. 5 (UPI) — The possible impact of human activity on the world’s environment and climate may not be known for 40 years or more, U.S. researchers say.
A Texas A&M study shows that although it is evident the world is experiencing one of the fastest warming rates since the beginning of climate r... | <urn:uuid:fd3164e1-7c01-4fde-a0e0-012a9cb02308> | 3.3125 | 426 | Truncated | Science & Tech. | 32.644623 |
Itokawa’s Muses Sea (the smooth area near the center), where HAYABUSA collected its sample
Optical microscope photo of Itokawa dust particles supported by 5-µm-diameter carbon fibers (courtesy: Osaka University/JAXA)
For me, it’s the amazing amount of information such tiny samples hold about the heating history of the ... | <urn:uuid:a4d0c0d4-6fcd-4a73-bc62-534ac7727dcb> | 3.453125 | 1,705 | Audio Transcript | Science & Tech. | 53.997704 |
Name: Steve L.
Date: July 2003
If centrifugal forces are "Imaginary" or "virtual", then how does a centrifuge manage
to separate particles in immersion according to their mass?
I hope I am understanding your question correctly. I do not know what you mean by "virtual" or
"imaginary". The force is a REAL one. As you spi... | <urn:uuid:57daa09d-a06d-41e1-8214-150073192a00> | 3.21875 | 785 | Q&A Forum | Science & Tech. | 53.54861 |
This class can be used to encrypt data (messages, files) and hide that data in images using steganography techniques. Steganography is the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message; this is in contrast to cryptography, wh... | <urn:uuid:6cb51bbe-4c54-449d-bf2e-e30f053d1522> | 3.078125 | 241 | Knowledge Article | Software Dev. | 23.241574 |
July 8, 2009–Good solar potential, relative proximity to existing or potential energy transmission corridors, and the perception of the fewest conflicts with existing land uses and the natural environment were factors in site selection.
May 27, 2009–Researchers from California and Hawaii have analyzed 25 factors and de... | <urn:uuid:e3661328-c220-4ec8-b875-16007b80c388> | 2.90625 | 196 | Content Listing | Science & Tech. | 20.116552 |
To help clarify: the term ASP is an acronym for Active Server Pages, which was coined some years ago. ASP.NET makes use the core .NET framework to accomplish it's goals, and is available in several languages (E.G. C#, VB).
that kind of exactly same mostly i mean to say .net or asp.net both are similar. When you add .ne... | <urn:uuid:0aa1084b-c599-4c0c-8222-9ca0061f785a> | 3.5 | 261 | Comment Section | Software Dev. | 69.850195 |
LA Plans a Massive Water Conservation Plan
A $2 billion proposal to conserve water for the City of Los Angeles California has reached city officials who will take a serious look at the future of water. The plan proposes a massive water conservation plan to conserve about 32 billion gallons of water each year!
Part of t... | <urn:uuid:5d661cd6-e7b9-483a-8f6c-accd01456e8b> | 2.703125 | 385 | Personal Blog | Science & Tech. | 49.386403 |
Data reported by the weather station: 865823 (SULS)
Latitude: -34.85 | Longitude: -55.1 | Altitude: 30
Weather Maldonado - Capitan Corbeta
|Main||Year 1997 climate||Select a month|
To calculate annual averages, we analyzed data of 359 days (98.36% of year).
If in the average or annual total of some data is missing info... | <urn:uuid:46da6788-c720-4571-abea-d96e2f8d65a7> | 2.703125 | 364 | Structured Data | Science & Tech. | 65.827506 |
3. Color - color diagram
From data in Tables 3 and 4, after the IRAS fluxes are transformed into magnitudes without color corrections according to Cheeseman et al. (1989), different infrared color-color diagrams can be plotted: () - () in Fig. 1; () - () in Fig. 2; () - () in Fig. 3 and () - () in Fig. 4. In those figu... | <urn:uuid:627c94ba-49ab-4079-a3b0-1df27a69ab0c> | 3.4375 | 999 | Academic Writing | Science & Tech. | 67.166366 |
``It's been a long strange trip for this universe we call home ...."
Interest in cosmology undoubtedly predates recorded human history. The question of the origin, composition, structure and fate of the universe has challenged lay persons, scientists, philosophers and theologians across racial and cultural barriers. It... | <urn:uuid:9a1856dd-f0fa-4931-a960-1cfeeb9a657b> | 3.578125 | 275 | Knowledge Article | Science & Tech. | 37.488136 |
Canadian gun-launched orbital launch vehicle. In 1962-1967 Canada's Gerard Bull led development of the Martlet system for gun-launched access to space. The program was cancelled before the objective of gun launch to orbit was attained.
Even after the rocket established its primacy as a method of accessing space, Gerald... | <urn:uuid:e82b973d-df77-4a75-8aa2-c3c35ba12955> | 3.59375 | 810 | Knowledge Article | Science & Tech. | 57.774986 |
One Of The Strange Mysteries Of Our Sky
Galaxies are mysteries of the sky, all unique in their own way. Come explore with me about galaxies, our Milky Way, and more.
Now, you might be wondering how galaxies are made. Just, how did they appear in our universe? Well, I’m here to answer your questions. Galaxies are made u... | <urn:uuid:67db2c91-fb06-418d-861b-836b0f9e970c> | 3.671875 | 361 | Personal Blog | Science & Tech. | 65.348783 |
The map shows temperature changes for the last decade--January 2000 to December 2009--relative to the 1951-1980 mean. Warmer areas are in red, cooler areas in blue. The largest temperature increases occurred in the Arctic and a portion of Antarctica. (Credit: NASA)
From Science Daily:
ScienceDaily (Jan. 22, 2010) — A n... | <urn:uuid:99243111-497c-4567-b42f-3fc307c6b68c> | 3.234375 | 226 | Truncated | Science & Tech. | 63.77 |
Investigate the molecular masses in this sequence of molecules and deduce which molecule has been analysed in the mass spectrometer.
Explore the distribution of molecular masses for various hydrocarbons
Which dilutions can you make using only 10ml pipettes?
Get some practice using big and small numbers in chemistry.
Ma... | <urn:uuid:548c2d67-bc41-41d2-a5c5-5fdab7c560d4> | 3.875 | 477 | Content Listing | Science & Tech. | 46.34103 |
By David L. Brown
One of the things that helps slow the rise of carbon dioxide in our atmosphere—and the greenhouse warming that results from higher CO2—is the fact that more than a third of the carbon released into the air since the beginning of the Industrial Revolution has been absorbed in our oceans and sequestered... | <urn:uuid:a4c236d3-0ffd-4fb6-9bbf-b591923c00fe> | 3.859375 | 1,831 | Personal Blog | Science & Tech. | 38.556122 |
Branched chain surfactants were some of the first used and manufactured. They were chosen over their linear counterparts due to increased solubility. However, the very slow biodegradation of branched chain surfactants lead to their ultimate replacement with the linear counterparts. The branched species are still used i... | <urn:uuid:1bfe7b27-bb6f-4fe8-ad54-2eab47e93e5f> | 2.734375 | 477 | Knowledge Article | Science & Tech. | 40.572697 |
Section illustrating the structure of the ocean's floor. Brief Introduction of the Model of Ocean Expanding Floor The model mainly demonstrates the processes of the formation and distinction of the ocean floor. Due to the intrusion of the new substances from the asthemosphere underneath the edges of the lithosphere, th... | <urn:uuid:48ac7759-b1d4-4400-8232-0cf44cce8148> | 4.03125 | 239 | Knowledge Article | Science & Tech. | 50.904615 |
Two related quantities x and y are called proportional (or directly proportional) if there exists a constant non-zero number k such that
- y = kx
In this case, k
is called the proportionality constant
of the relation. If y
are proportional, we often write
- y ~ x.
For example, if you travel at a constant speed, then th... | <urn:uuid:ef5b19f2-9538-4917-a0ed-23f95137d390> | 4.5625 | 263 | Knowledge Article | Science & Tech. | 30.71288 |
1.)When do action and reaction forces within a system not cancel each other? a.)When the action force is double the resistance of friction =b.)When the reaction force is contained in separate events c.)Never, they always cancel each other d.)Only on February 29th during a full...
Though in the first one you may not eve... | <urn:uuid:0d2302d7-b8f2-4a50-928a-322a379cdbd6> | 3.484375 | 432 | Q&A Forum | Science & Tech. | 83.485806 |
Death in the Deep Freeze
Preserve your Body for a Better Future
Cryogenics: The branch of physics dealing with the production and effects of very low temperatures.
The one certainty in life is death! But, a small group of people are attempting to defy the inevitable. Their ticket to a second life is a controversial exp... | <urn:uuid:f4a79f5f-932d-4d68-beaf-0e6e6ed1c5a4> | 2.84375 | 1,032 | Knowledge Article | Science & Tech. | 39.458596 |
India's dwindling forests could be revived with the help of an artificial topsoil made from waste. Initial studies suggest that the mixture of sewage sludge, fly ash (the residue from burning coal) and weed compost can increase plant growth by between 50 and 200 per cent on poor eroded soils.
Researchers from the Depar... | <urn:uuid:cc3689bf-6eac-4dff-bfd4-a11697d89118> | 3.578125 | 203 | Truncated | Science & Tech. | 54.508995 |
Date: Spring 2012
I am teaching a high school Earth and Space Science class to a group of graduating students. I was curious if you know of some approach or way I could include kite flying into a lesson? This way they could get outside and soak up some fresh air and relax a little in the last couple weeks of school. I ... | <urn:uuid:6f03f43c-d446-4366-8d42-6ed5db1627d3> | 3.1875 | 607 | Comment Section | Science & Tech. | 64.121592 |
Though pretty, purple loosestrife has the ability to overrun native plants
Nonnative species are also referred to as introduced, exotic, or alien species. The National Park Service defines nonnative as species that occur in a given place as a result of direct, indirect, deliberate, or accidental actions by humans. Plan... | <urn:uuid:04492fea-4dfa-47f5-9c5a-65914819d1d9> | 3.703125 | 406 | Knowledge Article | Science & Tech. | 20.353891 |
Quantitating DNA - How they did it back then? (Feb/15/2009 )
We now know that DNA with a concentration of 50ug/mL has an OD of 1.0 at 260nm and this value helps us determine our sample's DNA concentration.
Can anyone shed light or provide links as to how scientist arrive at that relationship? If it's by a standard curv... | <urn:uuid:c07a34ef-efcc-465e-9dd9-f5d28d48e1ec> | 2.953125 | 219 | Comment Section | Science & Tech. | 72.768057 |
Narrator: This is Science Today. Planets discovered
outside our solar system were found to have an elliptical
orbit, rather than the circular orbit of our own planets.
Geoff Marcy, a professor of astronomy at the University
of California, Berkeley, says this makes astronomers
wonder if circular orbits are necessary for... | <urn:uuid:3b2d401e-f3ae-4d66-97ab-204e6e7c73e9> | 3.5625 | 280 | Audio Transcript | Science & Tech. | 35.948 |
There are nearly 450 nuclear reactors in the world, with hundreds more either under construction or in the planning stages. There are 104 of these reactors in the USA and 195 in Europe. Imagine what havoc it would wreak on our civilization and the planet’s ecosystems if we were to suddenly witness not just one or two n... | <urn:uuid:5e6e859b-4968-4965-8143-522ca3cca03c> | 3.484375 | 464 | Personal Blog | Science & Tech. | 30.120249 |
This is an image showing the clouds of Titan.
Can there be Life in the Environment of Titan?
Titan's atmosphere is a lot like the Earth's, except that it is very cold, from -330 degrees to -290 degrees! Like the Earth, there is a lot of Nitrogen and other complex molecules. There also may be an ocean of methane, or per... | <urn:uuid:5dfc084e-a65b-48d5-a236-1559c0c2e5d5> | 3.140625 | 626 | Content Listing | Science & Tech. | 56.016376 |
News story originally written on March 15, 1999
Right now you can see all 110 Messier objects in one night. This only
happens for a little while each year. There's a new moon
out so the night sky is
dark. That makes it easier to see the objects.
During special times like this, people try to see how many Messier
objects... | <urn:uuid:a3bae78a-472b-4ef9-8e94-dd7cfee61ee7> | 3.265625 | 450 | Content Listing | Science & Tech. | 68.237555 |
Sunday, August 19, 2012
THE WORLD'S GREATEST MIMIC
Discovered in 1998 off the coast of Indonesia, the mimic octopus is the first known species to take on the characteristics of multiple species.
The octopus grows to about 2 feet in length and primarily lives in the seas of Southeast Asia. It impersonates at least 15 di... | <urn:uuid:a4743c52-e2d3-4b29-94e1-e12ef5e06f20> | 3.296875 | 156 | Personal Blog | Science & Tech. | 43.350562 |
At the corner of the cube circular arcs are drawn and the area enclosed shaded. What fraction of the surface area of the cube is shaded? Try working out the answer without recourse to pencil and paper.
At the beginning of the night three poker players; Alan, Bernie and Craig had money in the ratios 7 : 6 : 5. At the en... | <urn:uuid:0d5126f5-4c2c-434c-b052-25edb0736e42> | 3.3125 | 508 | Tutorial | Science & Tech. | 67.067814 |
Wooller, Luke; van Wyk de Vries, Benjamin; Cecchi, Emmanuelle and Rymer, Hazel
Due to copyright restrictions, this file is not available for public download
Click here to request a copy from the OU Author.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/doi:10.1007/s00445-009-0289-3|
|Google Scholar:||Look up... | <urn:uuid:7422b6cd-a7e5-440c-98c6-473ef289fe7a> | 3.125 | 626 | Academic Writing | Science & Tech. | 20.659821 |
Comet C/2009 R1 has been discovered in September 2009 by Robert H. McNaught in the course of Australia’s Siding Spring Survey.
For more information about the discovery of this comet, please see our previous post:
The comet is now around magnitude 7.5 and it will be a nice binocular object. Throughout this apparition it... | <urn:uuid:11785ac3-876d-4340-bf1a-dafdaedf6f93> | 3.4375 | 240 | Personal Blog | Science & Tech. | 53.893379 |
View the U.S. Severe Weather Map.
Hail is a form of frozen precipitation that's created by strong thunderstorms with fast updrafts—air being pulled upward into a thunderstorm. It can cause serious damage, especially to cars, aircraft, glass-roofed structures, and most notably, farmers' crops. Hail causes approximately ... | <urn:uuid:f95ae24c-a4d1-4ed8-be26-ad84cf01f1cd> | 3.875 | 629 | Knowledge Article | Science & Tech. | 64.613658 |
Ever seen little points of light buzzing around outside on summer nights? Those lights - fireflies – are beetles that create light through a chemical reaction. By controlling the reaction, fireflies can turn on and off their lights. They flash light to communicate and find a mate.
Fireflies may be disappearing from som... | <urn:uuid:13134907-12b6-44e1-8505-dbd2b17e684a> | 3.65625 | 648 | Personal Blog | Science & Tech. | 47.86154 |
To determine how elevated CO2 may reduce water use by crops,
plant physiologist James Bunce measures water vapor conductance of barley
leaves grown at twice the current atmospheric CO2 concentration.
Understanding climate change on a
global scale means getting up close and personal with a single plant--or even
with a s... | <urn:uuid:2e62d225-0ab9-4795-b451-3fcb7fa718b2> | 3.59375 | 975 | Knowledge Article | Science & Tech. | 33.211943 |
One of the most fascinating questions that occurs when contemplating the universe is whether there other life exists, equally or more intelligent than we. Are there alien eyes looking at our star or our galaxy and do these creatures ask the same cosmological questions we ask? Nobody knows, although the straightforward ... | <urn:uuid:a7681a55-3804-4087-a7d8-8ac96c82f10c> | 3.75 | 1,147 | Academic Writing | Science & Tech. | 59.664198 |
Random number generation is tricky business. Good random number generation algorithms are tricky to invent. Code implementing the algorithms is tricky to test. And code using random number generators is tricky to test. This article will describe
SimpleRNG, a very simple random number generator. The generator uses a wel... | <urn:uuid:9139d9a1-0c4f-49eb-8543-59305e79394a> | 2.6875 | 1,209 | Documentation | Software Dev. | 46.138573 |
FIGURE A2.1. (a) Daily amplitudes of the Arctic
Oscillation (AO) the North Atlantic Oscillation (NAO), and the
Pacific-North American (PNA) pattern. The pattern amplitudes for the
AO, (NAO, PNA) are calculated by projecting the daily 1000-hPa
(500-hPa) height anomaly field onto the leading EOF obtained from
standardize... | <urn:uuid:1161c33b-fa3c-4cb7-91e8-3bb40ac222f6> | 3.046875 | 226 | Documentation | Science & Tech. | 59.694141 |
New analysis of an experiment performed by the Viking landers suggests that evidence of microbial life in the Martian soil may have been detected 36 years ago. As one of the authors of this new paper puts it: "on the basis of what we've done so far, I'd say I'm 99 percent sure there's life there." Whoa.
Remember when e... | <urn:uuid:571d4da7-62fd-48a5-8181-549ca2480e4b> | 3.1875 | 587 | Content Listing | Science & Tech. | 58.046521 |
- Reader's Guide
- Summary for Decision-makers
- Key Questions in the Millennium Ecosystem Assessment
- How have ecosystems changed?
- How have ecosystem services and their uses changed?
- How have ecosystem changes affected human well-being and poverty alleviation?
- What are the most critical factors causing ecosyste... | <urn:uuid:4560790f-34af-4e30-afec-c1a1b6c35eeb> | 3.296875 | 260 | Truncated | Science & Tech. | 22.45625 |
Found 30 - 40 results of 76 programs matching keyword "feautures of mars"
Engineers at the Jet Propulsion Laboratory (JPL) explain how they simulate martian conditions and conduct tests with model rovers to prepare the Curiosity rover for its journey to Mars and its work on the red planet. Join the Exploratorium crew o... | <urn:uuid:5ef7f527-5f03-455c-8ae7-c9d035f92f89> | 3.015625 | 617 | Content Listing | Science & Tech. | 50.004403 |
While Vilhelm Bjerknes and his team were developing their synoptic models in Bergen, a radically different approach to forecasting was being pursued by Lewis Fry Richardson. Richardson's starting point was the system of fundamental physical principles governing atmospheric motion. He assembled the set of mathematical e... | <urn:uuid:ff5c9465-5361-45ca-9e2d-e41191c545ff> | 2.90625 | 727 | Academic Writing | Science & Tech. | 35.077697 |
on the importance of water vapor and CO2
Robert Wagner (OD optometry) correctly recognizes that water vapor (what Robert Essenhigh refers to as “water gas”) is a key Greenhouse gas. Quoting the IPCC Fourth Assessment report: “Water vapor is the most important gaseous source of infrared opacity in the atmosphere, accoun... | <urn:uuid:9f970800-605e-408b-9a10-22b0bc6cf351> | 3.03125 | 342 | Personal Blog | Science & Tech. | 47.501219 |
Search our database of handpicked sites
Looking for a great physics site? We've tracked down the very best and checked them for accuracy. Just fill out the fields below and we'll do the rest.
You searched for
We found 10 results on physics.org and 102 results in our database of sites
102 are Websites,
0 are Videos,
and... | <urn:uuid:7dda5fb4-82f8-4f20-8b60-63bced0c1d35> | 3.21875 | 330 | Content Listing | Science & Tech. | 54.89436 |
Just when we were beginning to think the media had finally learned to tell a hawk from a handsaw when covering global warming (at least when the wind blows southerly), along comes this article ‘In Ancient Fossils, Seeds of a New Debate on Warming’ by the New York Times’ William Broad. This article is far from the stand... | <urn:uuid:c63c8328-5a5b-4ac6-a1f6-ab6a96ab70d9> | 2.890625 | 2,489 | Comment Section | Science & Tech. | 38.826521 |
March 3, 2008
A NASA spacecraft in orbit around Mars has taken the first ever image of active avalanches near the Red Planet's north pole.
Oct. 20, 2008
A curiously short-lived type of gamma-ray burst has astronomers puzzled. Leading experts discuss the clues at today's Gamma-ray Burst Symposium in Huntsville, Alabama.... | <urn:uuid:86045ceb-cf3e-4fe2-a342-3883a1dd90c6> | 3.09375 | 419 | Content Listing | Science & Tech. | 62.476959 |
The Weekly Newsmagazine of Science
|Recently on MathTrek:|
March 6, 1999
For a truly cool experience, there's nothing like transforming a 12-foot, 20-ton block of manufactured snow into a giant sculpture. That's the premise underlying the Breckenridge snow sculpture championships in Colorado, held annually in January.
... | <urn:uuid:ed2179ff-5a0e-4f3c-913e-b98eb285e994> | 2.859375 | 1,243 | Nonfiction Writing | Science & Tech. | 48.981113 |
Global warming increasing by 400,000 atomic bombs every day
Hawaii isn’t a place where giant hail forms. In fact, only eight times has hail the size of a penny or quarter been recorded for the islands. There were no records for hail larger than an inch until a freak supercell thunderstorm formed there on March 9, 2012.... | <urn:uuid:866438a7-6e68-4916-a4b8-6a4b128c1cc1> | 3.28125 | 1,613 | Personal Blog | Science & Tech. | 57.354323 |
Recent Solar Wind Observations
The solar wind plays a vital role
in transfering the effects of solar
activity to the Earth's space environment. The density, speed,
pressure, and temperature of the solar wind upstream of the Earth as well as the magnitude and direction of the interplanetary
magnetic field all influence ... | <urn:uuid:99cb3e39-fd86-432c-ac8f-b7de6a36a929> | 3.21875 | 215 | Knowledge Article | Science & Tech. | 37.793899 |
Previous abstract Next abstract
Radio astronomy observations in the HF (1-30 MHz) portion of the electromagnetic spectrum could result in new insights into astrophysical processes. However, this particular part of the spectrum is mostly inaccessible from the ground due to the effects of the Earth's ionosphere. One solu... | <urn:uuid:db01f428-ce90-4158-a5b8-031b3d2553fd> | 3.28125 | 425 | Academic Writing | Science & Tech. | 21.143845 |
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.
January 25, 1998
Explanation: Almost unknown to casual observers in the northern hemisphere, the southern sky contains two diffuse wonders known as ... | <urn:uuid:7c851639-92ff-4ba2-8ca8-1c592da751d1> | 3.515625 | 184 | Knowledge Article | Science & Tech. | 42.759545 |
Many technologies and techniques have been developed to confront the issue of global warming with many focusing on reducing the amount of greenhouse gases in the atmosphere, and others focusing on increasing the reflectivity of the Earth's atmosphere. Carbon sequestration, synthetic trees and stratospheric sulfur injec... | <urn:uuid:459ef30a-04db-4a07-9096-c0ab7be69289> | 2.734375 | 103 | Academic Writing | Science & Tech. | 22.020707 |
So by entangling two photons, for instance, physicists have demonstrated the ability to transmit quantum information from one place to another by encoding it in these quantum states—influence one of the pair and a change can be measured in the other without any information actually passing between the two. Researchers ... | <urn:uuid:fd79585f-2abb-480e-a8c6-c117393d7cc0> | 3.46875 | 272 | Personal Blog | Science & Tech. | 27.697586 |
Scientists in an increasing number of fields are doing science in new ways, exploiting powerful new data-collection technologies with the aid of computational methods and a little humility.
Tradition demands that science always be hypothesis-driven: First, try to guess the truth, and only afterward collect experimental... | <urn:uuid:8187fd45-93d3-4378-9c6e-013366ec4da7> | 3.46875 | 525 | Personal Blog | Science & Tech. | 28.285446 |
Specifies the execution states of a Thread.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Assembly: mscorlib (in mscorlib.dll)
|The thread has been started, it is not blocked, and there is no pending ThreadAbortException.|
|The thread is being requested to stop.... | <urn:uuid:4e463226-c495-499d-99ed-55cbc486619a> | 2.828125 | 853 | Documentation | Software Dev. | 56.402926 |
Mission Plan - Windows to the Deep
Exploration of the Blake Ridge
Dr. Carolyn Ruppel, Co-Chief Scientist
Georgia Institute of Technology
The cold seeps on the Blake Ridge and Carolina Rise are located several hundred kilometers offshore of the Southeastern U.S. These seeps act as vents for methane that originates in th... | <urn:uuid:d6303909-5098-4795-b6f2-5ce33635290f> | 3.625 | 813 | Knowledge Article | Science & Tech. | 28.293371 |
Secchi Disk Depth
One of the most commonly used measurements for water clarity is the Secchi disk depth (pronounced she SEHK-ki) . The Secchi disk is a simple and inexpensive device used by both citizens and scientists for measuring water clarity.
The device generally consists of a 20-centimeter (8-inch) disk made of w... | <urn:uuid:cfe021db-1725-4711-bdf6-abb6086e2367> | 3.359375 | 175 | Knowledge Article | Science & Tech. | 52.005 |
Family: LYCAENIDAE (Coppers, Hairstreaks and Blues)
A relatively small butterfly, the Melissa Blue is about an inch in wingspan. The sexes are dimorphic, meaning each sex has its own color. Males are a beautiful blue while females are brown. A distinguishing characteristic is the red-orange submarginal row of scales in... | <urn:uuid:824fee9f-e357-4e1e-a58c-58a3d62f7224> | 3.40625 | 226 | Knowledge Article | Science & Tech. | 43.182504 |
Human-forced climate change has already many effects that are visible today. An article that appears in today’s Science introduces another candidate: trees in the Western U.S. are living only half as long as they did 50 years ago. In the climate most of us grew up in, western forests acted as carbon sinks. Their growth... | <urn:uuid:5665b7d7-99fd-43ff-87e6-1b3b60f484e9> | 3.5625 | 817 | Personal Blog | Science & Tech. | 48.739123 |
|This fire-breathing Dragon can fly. Pictured above yesterday, SpaceX Corporation's Falcon 9 rocket capped with a Dragon spacecraft lifted off from Cape Canaveral, Florida, USA. The successful launch was significant not only because it demonstrated that a private company has the ability to re-supply the International S... | <urn:uuid:a229673b-38bd-4ad1-b612-d63ce9a49ff1> | 2.875 | 196 | Truncated | Science & Tech. | 38.912883 |
Comet color and you
March 2013: Take this month's observing opportunity to test out your eyes’ color receptors.
January 28, 2013
|Red sensitive? Blue sensitive? How perceptive are your eyes to the colors of astronomical objects? One way to find out is to observe newly discovered Comet C/2011 L4 (PANSTARRS) with friends... | <urn:uuid:714a68cd-1048-474c-aee4-97729bcf616d> | 3.109375 | 340 | Truncated | Science & Tech. | 52.913293 |
What is Copyleft?
Copyleft is a general method for making a program (or other work) free, and requiring all modified and extended versions of the program to be free as well.
The simplest way to make a program free software is to put it in the public domain, uncopyrighted. This allows people to share the program and the... | <urn:uuid:9b4aa105-c516-4a9e-b057-304fdc530ae4> | 3.546875 | 1,063 | Knowledge Article | Software Dev. | 43.058114 |
By Helen Taylor/Nature Conservancy
Tiny mussels that wash up on beaches and attach to boats, piers and underwater pipes. Mats of vegetation that blanket lakes and take the fun out of boating, fishing and water-skiing. Tall grasses that invade shorelines, blocking lake views.
In the Great Lakes states, we’ve read about ... | <urn:uuid:65458bdf-307b-4101-b4eb-70959ff7b791> | 3.0625 | 757 | Nonfiction Writing | Science & Tech. | 36.596393 |
Solar Plasma Swirls, Erupts
A prominence composed of solar plasma just behind the edge of the Sun, rose up and swirled around for many hours, then burst away into space over about a one-day period (Nov. 18-19, 2012). Unseen magnetic fields, mostly above this area, are the driving forces behind the event. This action wa... | <urn:uuid:fa6c682c-6ac7-4670-bf1a-82fde87b32ce> | 2.78125 | 118 | Truncated | Science & Tech. | 43.787261 |
Date: Around 1993
I have heard that supposed "space plane prototype" that flew over
California and Denmark, and a few other countries. I read an article which
said that it used an engine which ran on liquid methane. Is this the same as
methanol in cars? Also, is this plane's engine a Scramjet (what is this
engine about... | <urn:uuid:0d12f3eb-9a70-4e61-956c-25149f2b6611> | 2.734375 | 142 | Knowledge Article | Science & Tech. | 50.786962 |
Search our database of handpicked sites
Looking for a great physics site? We've tracked down the very best and checked them for accuracy. Just fill out the fields below and we'll do the rest.
You searched for
We found 6 results in our database of sites
6 are Websites,
0 are Videos,
and 0 are Experiments)
Search results... | <urn:uuid:20e5e0c7-407e-47f0-b881-a6ae9ea3b47e> | 3.203125 | 279 | Content Listing | Science & Tech. | 46.258456 |
What is the meaning of the decimal point?
Here is an illustration of the most common answer in my class (a math content course for prospective elementary and special ed teachers):
Thinking of the decimal point as the border between whole numbers and decimals limits our ability to think about relationships between these... | <urn:uuid:560400e3-6e83-42b5-b3d2-373e861ff13e> | 3.6875 | 292 | Personal Blog | Science & Tech. | 53.309306 |
Non-native to Chesapeake Bay; invasive
- Family - Hydrocharitaceae
- Distribution - Hydrilla is an exotic species introduced
from southeast Asia which first appeared in United States during 1960's. Today
it is found in most of the southeastern United States, westward to California.
Hydrilla was first observed in 1982 i... | <urn:uuid:e33140fa-ddc0-45a4-aabf-b8cc87cc06ba> | 3.625 | 796 | Knowledge Article | Science & Tech. | 41.061922 |
- (US) IPA: /ləˈbɛːɡ ˈɪntəɡrəl/, /ləˈbɛːɡ ˈɪntəɡrl̩/
Lebesgue integral (plural Lebesgue integrals)
- (analysis, singular only (the Lebesgue integral) and countable) An integral which has more general application than that of the Riemann integral, because it allows the region of integration to be partitioned into not ju... | <urn:uuid:75e60f75-f0c1-4e83-8160-9660583ef38f> | 2.828125 | 194 | Knowledge Article | Science & Tech. | 32.622602 |
Restoration of Fish Habitat in Relocated Streams
FLOW IN NATURAL STREAMS
Rivers and streams are nature's channels for the disposal of surface runoff. Stream flows vary
continuously from day to day, month to month, and year to year, and the variations between the
greatest floods and the lowest flows can be very large. A... | <urn:uuid:387694f3-83d6-48cf-a1f4-98d77fe7644f> | 4.21875 | 2,423 | Knowledge Article | Science & Tech. | 52.026867 |
A circle has a unit circle (radius, r = 1) removed from its centre to produce an annulus.
If the area remaining is the same as the unit circle removed, find the width of the annulus.
Let the radius of the original circle be, r.
If the area remaining is equal to the area removed (a unit circle), the area of the original... | <urn:uuid:75e88997-89b1-4f9c-af0e-c65bb577bcf3> | 4.1875 | 124 | Tutorial | Science & Tech. | 69.889058 |
Some data referring to the number of survey fields, and the number of galaxies examined, are summarized in Table 2. In the survey areas there are altogether 1273 galaxies with diameters larger than the above limits, and in the comparison areas 2084. The entire material thus comprises 3357 galaxies distributed over 518 ... | <urn:uuid:5be430e4-37ac-4778-aae3-7e894c9a23b4> | 3.03125 | 1,351 | Academic Writing | Science & Tech. | 49.93416 |
Apr 27, 2005
A little known fact: Popular ideas about the Sun have not fared well under the tests of a scientific theory. The formulators of the standard Sun model worked with gravity, gas laws, and nuclear fusion. But closer observation of the Sun has shown that electrical and magnetic properties dominate solar behavi... | <urn:uuid:9e5e6f80-1bb6-49c4-9ef1-22edcf01aeed> | 3.9375 | 2,081 | Personal Blog | Science & Tech. | 33.054237 |
Dust Plume Across Northern Patagonia
A checkerboard of growing (dull green) and fallow (tan) fields in northern Patagonia appears beneath a rippling plume of beige dust in this natural-color image from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite on September 11, 2009. The image sh... | <urn:uuid:a3ddeb0c-8d80-4e9c-95f9-00797003ee99> | 3.578125 | 175 | Truncated | Science & Tech. | 34.515641 |
Regular expressions are a well recognized way for describing string patterns. The following regular expression defines a floating point number with a (possibly empty) integer part, a non empty fractional part and an optional exponent:
[0-9]* \.[0-9]+ ([Ee](\+|-)?[0-9]+)?
The rules for interpreting and constructing such... | <urn:uuid:036e46cf-3866-407c-9a12-00e69319ebae> | 3.390625 | 1,935 | Documentation | Software Dev. | 51.360653 |
Editor's Note: This article was originally presented at ESC Boston 2011.
No software engineering process can guarantee secure code, but following the right coding guidelines can dramatically increase the security and reliability of your code. Many embedded systems live in a world where a security breach can be catastro... | <urn:uuid:4e890a66-39a7-46bf-848e-0d45600bf949> | 3.546875 | 668 | Truncated | Software Dev. | 48.938182 |
For more than twenty years, the Homestake Solar Neutrino Experiment in the Homestake Gold Mine in South Dakota has been attempting to measure neutrino fluxes from space; in particular, this experiment has been gathering information on solar neutrino fluxes. The results of this experiment have been checked against predi... | <urn:uuid:93f82ccd-7846-46a4-ad89-f06139df4f4c> | 3.75 | 970 | Knowledge Article | Science & Tech. | 31.30125 |
Joined: 16 Mar 2004
|Posted: Tue Apr 14, 2009 1:33 pm Post subject: Carbon nanotubes not toxic for mice
|A new pilot study has found that single-walled carbon nanotubes are not toxic to mice, even after a period of four months. The result means that SWNTs might not be toxic to humans either and could one day be used fo... | <urn:uuid:dafdcfb2-f54e-45bb-8ff7-ea83e91453cc> | 2.859375 | 476 | Comment Section | Science & Tech. | 44.762701 |
This image shows a rimless, irregular depression that appears brighter than the surrounding material. Such features are thought to be volcanic vents . The shadowed, curved feature leading into the vent is a fault scarp, also called rupes . This image was taken using the Narrow Angle Camera (NAC).
Date acquired: April 0... | <urn:uuid:4c5a1666-e4d0-4091-a13c-214f1cc8c484> | 3.40625 | 89 | Knowledge Article | Science & Tech. | 26.347404 |
(1) An abstract class may contain complete or incomplete methods. Interfaces can contain only the signature of a method but no body. Thus an abstract class can implement methods but an interface cannot implement methods.
(2) An abstract class can contain fields, constructors, or destructors and implement properties. An... | <urn:uuid:1a172ac3-b411-4e7b-86df-d530346ccb18> | 3.34375 | 197 | Q&A Forum | Software Dev. | 38.82897 |
Like people who approach geopolitics with the attitude of "If people would just talk to each other, we would all along", there are a lot of naïve assumptions about just dumping gasoline.
We know it causes emissions, and emissions are bad, we know a lot of the money paid for oil goes to fund Middle Eastern terrorism, an... | <urn:uuid:fa054ec6-08f8-46e8-a77f-1b36851b3205> | 3.109375 | 1,097 | Personal Blog | Science & Tech. | 31.641054 |
UML 2 in a Nutshell: Use Case Diagrams
Source: O'Reilly Media
Use cases are a way to capture system functionality and requirements in UML. Use case diagrams consist of named pieces of functionality (use cases), the persons or things invoking the functionality (actors), and possibly the elements responsible for implemen... | <urn:uuid:284610c1-f89b-4007-acc8-069ea70140b4> | 3.84375 | 129 | Knowledge Article | Software Dev. | 30.199588 |