When you're the host country, you get to build the biggest pavilion. Every photo I've seen of China's Expo HQ doesn't do its incredible scale justice. See those little dots at the base? Those are people.
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.