As Japan scrambles to cope with a nuclear reactor damaged in the quake, Josh Dzieza talks to a nuclear expert at MIT about how the plants work, worst-case scenarios, and more.
Police officers wearing respirators guide people to evacuate away from the Fukushima Daiichi nuclear plant following an order for residents who live in within a 10 km (6.3 miles) radius from the plant after an explosion in Tomioka Town in Fukushima Prefec
