It was both a high drama rescue and a defining moment for implements of oral hygiene. During a hastily scheduled six-and-a-half hour spacewalk yesterday, a NASA astronaut and her Japanese counterpart fixed the broken $150 billion dollar International Space Station. Key to their success: a toothbrush.
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.