Fast reactors can shrink nuclear-waste stockpiles, but can designers tame the inherent hazards?
The U.S. will still need more big breakthroughs to eliminate the need for imported oil.
Transatomic is developing a new kind of molten-salt reactor designed to overcome the major barriers to nuclear power.
Advanced materials and smart design could lower turbine blade costs by 40 percent.
A proposed engine design approaches the efficiency of gas-electric hybrids, but could be far cheaper.
Hybrids are a much more cost-effective way to reduce carbon emissions than newly released hydrogen fuel cell cars.
Crop yields are expected to decline due to climate change faster than scientists thought.
But is the company scaling up its technology too fast?
The technology could make it cheaper to use wind and solar power and to switch to natural gas from coal.