The demon core was a 6.2-kilogram (14 lb; 1 st), 3.5-inch-diameter (89 mm) subcritical mass of plutonium which went briefly critical in two separate accidents at the Los Alamos laboratory in 1945 and 1946. Each incident resulted in the acute radiation poisoning and subsequent death of a scientist. After these incidents the spherical plutonium pit was referred to as the "demon core."

When it comes to business, toys are anything but child's play. Here are the top turning points in the history of the modern toy industry.

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The most viral images on the internet, curated in real time by a dedicated community through commenting, voting and sharing.

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Chinese material scientists have created the world's lightest material: A graphene aerogel that is seven times lighter than air, and 12% lighter than the previous record holder (aerographite). A cubic centimeter of the graphene aerogel weighs just 0.16 milligrams -- or, if you're having a problem conceptualizing that, a cubic meter weighs just 160 grams (5.6 ounces). The graphene aerogel is so light that an cube inch of the stuff can be balanced on a blade of grass, the stamen of a flo...

Like most people, I enjoy burritos. Unlike most people, I also enjoy learning about ancient hieroglyphic writing systems, because I’m Indiana—er—Language Jones. A while back, I bought Stone & Zender’s Reading Maya Art: A Heiroglyphic Guide to Ancient Maya Painting and Sculpture, and borrowed or checked out a number of similar books from the library. I skimmed and enjoyed them, and then returned them. Stone & Zender took a place on my bookshelf and I moved on to other things...

BERLIN: The former oil shale mining site of Messel, near Frankfurt, Germany, is well known for its spectacular fossils of organisms that lived between 47 million ...

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We've already found the most famous book in every state. But what about your favorite shows? Earlier this year, we ran a map from Reddit user SomeGuyFromCanada listing the most significant shows set in every state. We weren’t happy with all of the selections (no “Breaking Bad” or “Happy Days”?) so we hit the books to discover the shows representative of our nation.

10 Deadliest Snipers of World War II   The highly skilled sharpshooters known as snipers (a term that originated in British India to describe hunters able to pick off the elusive “snipe” bird) became vitally important during the Second World War. Fighting on the Eastern Front, the Soviets...

No matter what side of the Oxford comma debate you find yourself on, you'll …

How Whole Foods Attracts Complete Shitheads.

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