Imagine a telescope array that exceeds the height of the Empire State Building, the Chicago Sears Tower, and Shanghai's World Financial Center combined. That's what astronomers are piecing together about a mile beneath the ice at the South Pole. But this telescope isn't aimed at the sky -- it points to the center of the Earth.
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.