Vijay Varma

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Anant Agarwal: Why massively open online courses (still) matter

Learning

APOD: The Horsehead Nebula (2013 Dec 31) Image Credit & Copyright: John Chumack http://apod.nasa.gov/apod/ap131231.html Explanation: The Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the red emission nebula in the center of the above photograph. The horse-head feature is dark because it is really an opaque dust cloud that lies in front of the bright red emission nebula. Like clouds in Earth's atmosphere, this cosmic cloud has assumed a recognizable shape by chance. After many thousands of years, the internal motions of the cloud will alter its appearance. The emission nebula's red color is caused by electrons recombining with protons to form hydrogen atoms. Also visible at the bottom left of the picture is a greenish reflection nebulae that preferentially reflects the blue light from nearby stars. http://www.galacticimages.com/catalog/about_us.php Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=131231 #APOD

Glass Viruses And Other Amazing Images From This Week

Caught by Eye Reflection?!

You’ve probably seen it happen in a movie or television show. The cops are at their wits end trying to identify a suspect but catch a break when they …

VisaMapper Is A Magical Map Where You Can See Which Countries Require Visas To Visit

This might be the most brilliant thing a Reddit user has done in a while.<p>To curb the pain of the "do I need a visa?!" research headache, udit99 made a no-frills website called VisaMapper. Visitors select their nationality from a drop-down menu and instantly see, on a color-coded world map, which …

The 25 best entertainment apps to download now

Watch films and TV, listen to the radio, book concert tickets - there's an app for it all. Many, many apps, in fact. We look at 25 of the best.<p>Sky Go<p>Free (subscription required); iPad, iPhone and Android<p>Offering entertainment from Sky’s live TV and Anytime+ movies and sports content, Sky has upped …

Loksatta

गाभारा<p>दर्शनाला आलात? या..<br>पण या देवालयात, सध्या देव नाही<br>गाभारा आहे, चांदीचे मखर आहे....<br>सोन्याच्या सम्या आहेत, हिर्‍यांची झालर आहे.<br>त्यांचही दर्शन …

Life in close-up: photomicrography competition winners - in pictures

Nikon has announced the winners of its 2013 Small World Photomicrography Competition. Winning images were selected for displaying both artistic quality and scientific technique. Eric Flem at Nikon said: "After 39 years we are proud to watch the competition continue to grow, allowing us to honor …

Albert Einstein Reads ‘The Common Language of Science’ (1941)

Here's an extraordinary recording of Albert Einstein from the fall of 1941, reading a full-length essay in English:<p>The essay is called "The Common …

6 Chemical Reaction GIFs That Will Make You a Smarter Person

Remember how much fun your high school chemistry class was? Neither do we. But that may be because there weren't enough explosions. Well, nowadays, …

Every Nerd Will Love This Errol Morris-Benoit Mandelbrot Interview

"A formula can be very simple and create a universe of bottomless complexity."<p>Perhaps it's because they create an infinity of interesting from simple equations.<p>Perhaps it's because they suggest that many seemingly chaotic phenomena have an underlying order.<p>Perhaps it's because they were great early …

Le Chatelier's principle

<b>Le Chatelier's principle</b> (pronounced /lə ˈʃɑːtəlieɪ/), also called <b>Chatelier's principle</b> or "The Equilibrium Law", can be used to predict the effect …

How to Tour the World’s Greatest Science Labs

Need a break from mountains, wine and cheese? The CERN lab near Geneva, like many other research facilities, offers tours of the premises. Photo …

thatscienceguy:

Proof of the Pythagoras Theorem.

Cassini Photo: Stunning New Views of Saturn’s Hexagon Storm

Wildlife<p>NASA this week released the highest-resolution view yet of the unique, six-sided jet stream circling Saturn’s north pole—known as “the hexagon.” This movie (click image to run), made from images obtained by Cassini’s imaging cameras, is the first to show the hexagon in color filters. …

m1ssred:

APOD: The Hydrogen Clouds of M33 (2013 Dec 26) Image Credit & Copyright: Adam Block, Mt. Lemmon SkyCenter, U. Arizona http://apod.nasa.gov/apod/ap131226.html Explanation: Gorgeous spiral galaxy M33 seems to have more than its fair share of glowing hydrogen gas. A prominent member of the local group of galaxies, M33 is also known as the Triangulum Galaxy and lies about 3 million light-years distant. Its inner 30,000 light-years are shown in this telescopic galaxy portrait that enhances the reddish ionized hydrogen clouds or HII regions. Sprawling along loose spiral arms that wind toward the core, M33's giant HII regions are some of the largest known stellar nurseries, sites of the formation of short-lived but very massive stars. Intense ultraviolet radiation from the luminous, massive stars ionizes the surrounding hydrogen gas and ultimately produces the characteristic red glow. To enhance this image, broadband data was used to produce a color view of the galaxy and combined with narrowband data recorded through a hydrogen-alpha filter, transmitting the light of the strongest hydrogen emission line. To see the monochromatic narrowband data alone, move your cursor over the image, or take this video tour of the hydrogen clouds of M33. http://www.caelumobservatory.com/ http://skycenter.arizona.edu/ http://www.as.arizona.edu/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=131226 #APOD

Hydrogen Car: Pros, Cons, Costs

Epoch Times is taking a look at each of the major options for green driving. Hydrogen cars are not currently sold commercially, but some will be …