NASA's Mars Reconnaissance Orbiter, the largest and most powerful spacecraft ever built, is bound for the Red Planet this August. Watch an animation of the craft as it speeds into martian orbit at 25,000 mph, uses atmospheric friction to slow itself down to 300 mph, and settles into its final orbit less than 200 miles from the planet's surface.
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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.