This freshwater alga might ruin your appetite if you happen to stroll by some running water. Didymosphenia geminate likes to attach itself to streambeds by a stalk that feels like wet wool and mimics strands of toilet paper, unlike its slimier algae cousins. Eventually the stalks can form networks of extensive mats that threaten to smother streambeds and ecosystems. It's kind of scary for an alga with the nickname "didymo."single page
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.