Sometimes a manipulative parasite becomes the manipulated. This isopod crustacean, known as a "tongue louse," first enters a fish through the gills and chows down on the tongue until it reaches the stump. It then attaches itself to the tongue's base and feeds on blood from an artery -- as well as loose food particles consumed by the fish -- even as the fish continues to use the louse like its former tongue. The rest of the fish should still be good, though, so diners need not choke.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.