Bug News Roundup: Ant Rafts, Robot Caterpillars

Drop a clump of fire ants into water and they will assemble into a raft that stays afloat for weeks, according to a new study. Plus, a new soft-bodied robot is modeled after caterpillars that curl up and roll away from predators without joints. SciFri's "Pick of the Week" turns to insects and engineering this week.