It's a bacteria-eat-bacteria world, scientists say. Bdellovibrio bacteriovorus, shown here in false color, attacks common germs six times its size, then devours them from the inside out.
Alfred Pasieka/Science Source
MIT's Atlas robot, nicknamed Helios, completes the driving task at the June 2015 DARPA Robotics Challenge Finals. Helios is a second-generation Atlas, developed for DARPA by Boston Dynamics.