What looks like an ominous cloud actually poses little serious health risks for the US.
If workers are forced to abandon a troubled nuclear plant in Japan, a complete meltdown is possible.
The reactor design at the Japanese plant has long been superseded because of safety failings.
Pools storing spent fuel are overheating, posing the threat of increased radiation leaks.
Nothing can stop radioactive decay--that's why it's so useful in spacecraft batteries yet so troublesome in shut-down nuclear reactors.
Engineers struggle to keep reactors cool after explosions and radiation leaks.
As oil prices surge, funding for energy research is more important than ever.
The Secretary of the Navy says better batteries and electric grids will help protect soldiers.
Highs and lows for electric vehicle companies, and how to buy into the carpool lane.
An interactive chart shows how little the U.S. spends on R&D.