Fire ants might be infuriating little beasts, an invasive species we'd all be pleased to see banished to its native Brazil, but it turns out a fire ant colony has some pretty amazing properties. In groups, they knit together, more like a fabric than anything else, and are waterproof, totally flexible, and nearly indestructible. A mechanical engineer describes these groups as behaving like a thick liquid.
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.