Despite the severity of the crisis in Japan, Chernobyl remains the most devastating nuclear accident in history.
The ocean-going floats could track radioactive material as it approaches Hawaii and the U.S. West Coast.
Japan upgraded its month-old nuclear crisis to a maximum seven on the international scale of atomic disasters Tuesday, placing it on a par with Chernobyl.
The death toll of animals from the BP oil spill in the Gulf of Mexico may be 50 times higher than originally reported.
As workers continue efforts to control a steady radiation leak, the death toll from the disaster tops 10,000.
As fire and army crews race to prevent catastrophe, the disaster takes its toll on three workers.
With no water to cool the fuel rods, they could just get hotter and eventually melt down.
With the crisis escalating in Japan, a grateful and anxious nation is hoping nuclear engineers can prevent a meltdown.
The Japan nuclear disaster rates between Three Mile Island in Pennsylvania and Chernobyl.
Meteorologists say that contaminated dust from Fukushima could disperse in wide patterns.