For about $250, you can make your very own space-age spy tech, following an MIT professor's instructions.
It can capture high-resolution images of small objects -- like a message written in push pins that had been hidden behind a foam plate.
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.
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