Sewage is disgusting—unless you’re an environmental chemist. Then it’s a bonanza of fascinating data. An average sample contains millions of traceable chemicals, everything from steroids and antidepressants to rat poison and pesticides. It’s also home to plague, hepatitis and polio. Ready to dig in?
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.