Now entering its ninth year of operation on Mars, NASA’s Opportunity rover is proving that there’s not much it can’t do. It’s even getting into self-portraiture to pass the time.
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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