A robot entered a damaged reactor at Japan's Fukushima nuclear plant this week to take pictures of the reactor destroyed by an earthquake and tsunami in 2011. The robot, nicknamed 'The Little Sunfish,' is very small about the size of a loaf of bread. It has lights, five propellers, and two cameras, among other data collection tools. Toshiba Corp., the electronics and energy company, and the International Institute for Nuclear Decommissioning, a government-funded group, developed the Little Sunfish. Four operators control the Little Sunfish from afar. It is designed to tolerate radiation of up to 200 sieverts, a level that can kill humans instantly.