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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Cassini is the size of a small school bus. Imagine a Robot that big wheeling (or walking around mars). You could shove every instrument you ever needed on it. one step at a time I suppose. This new rover looks promising.