On the day of the rover's landing, NASA scientists move the final marble from a jar marked "Days Until Entry" to another jar marked "Days Since Launch."
Has anyone noticed that wherever humans touch ends up covered in junk?
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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