Shoot to Kill

In the post-Columbine world, police departments all over America are adopting new, no-nonsense SWAT-team tactics

The Hunt for the Origin of AIDS

The notion that AIDS arose from a polio vaccine made with contaminated chimpanzee cells—the thesis of the best-selling book The River—is far from the only theory about how the epidemic started, and it is hotly disputed. The quest for the source of the epidemic is intensifying, as researchers scour the jungle for clues and try to "walk back" the disease genetically with the help of the world's most powerful computers


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Where Time Comes From

The clocks that coordinate your cellphone, GPS, and more

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Computer Vision Syndrome and You

Save your eyes. Take breaks.

Video

What Happens in 60 Seconds

Quantifying human activity around the world

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