The Pentagon's classified "black" budget is bigger than it was during the Cold War, but the battlefield has changed completely. Popular Science reveals the secrets of America's 21st-century arsenal. By Sharon Weinberger
The Pentagon has put a $1-trillion price tag on Afghanistan's mineral wealth, but finding and extracting the riches won't be easy. By Matthieu Aikins
The courses that teach you to climb trees, use explosives and solve murders.
While their peers obsess on Facebook, these teens are solving some of the world's biggest problems.
In 2020, you could be flying space planes, reading minds, or curing disease in the womb. Start building the perfect résumé now. By Ben Paynter
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Science is reinventing play, from extreme sports to gamification to ridiculous roller coasters to the playgrounds of tomorrow, and this issue is chock full of fun. Also, on a less fun note: Did global warming destroy my hometown?