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
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.