It's that time again, the time for year-end wrap-ups. At PopSci, we expand the scope of our 2010 list to include the defining innovations in a wide range of categories. When viewed together here, it's a fascinating portrait of the year that was.
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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