Next time you're marveling at the fact that Spirit and Opportunity have been roving Mars for over six years now, ponder this: the two Voyager spacecraft have been hurtling through our solar system for nearly 33 years. Today, Voyager 1 hits a mission milestone of operating continuously for 12,000 days. The spacecraft launched on September 5, 1977, while Jimmy Carter was president, and has now traveled 14 billion miles.
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.