U.S. astronaut Don Pettit spent 191 days on the International Space Station, orbiting the Earth 3,088 times before landing in July. As Pettit was carried off after the landing, photographer Mikhail Metzel caught this surprisingly serene photo.
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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