As is the case every four years, only a lucky few will be able to see the summer Olympics live and in-person. The rest of us peasants will settle for watching and streaming the games from our homes. But if you want something that feels a little grander, maybe even cosmic, NASA has just released a series of satellite photos depicting past Olympic host cities from space. The earliest comes from 1997 and shows Atlanta, and the series goes all the way up to London 2012.
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.