Japan remains in a state of emergency three days after a devastating earthquake and tsunami hit the country. An estimated 10,000 people have died, and Japan is facing the world’s worst nuclear crisis since Chernobyl. Japanese authorities are scrambling to avert a meltdown at the stricken Fukushima nuclear reactor after a second hydrogen explosion rocked the facility. Nuclear fuel rods are now fully exposed at Reactor No.2 at the nuclear plant. The power plant’s operator, Tokyo Electric Power, said water levels inside the nuclear reactor were almost empty, raising fears of a meltdown. It is unclear how far the radioactive contamination has spread. U.S. military officials have reported that helicopters flying 60 miles from the plant picked up small amounts of radioactive particulates.