Pushing back the night with light of our own making was the first and greatest of humankind’s achievements. What a thrill it must have been to discover that the setting sun no longer had to mean darkness and fear. We’ve come a long way since that first campfire, but it’s just recently that technology has topped the most advanced form of open-flame light.
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.