Aquion Energy says its batteries could make the power grid unnecessary in some countries.
A novel manufacturing method could make it practical to stack solar cells and convert more of the energy in sunlight into electricity.
First, they teleported photons, then atoms and ions. Now one physicist has worked out how to do it with energy, a technique that has profound implications for the future of physics.
A promising advance that came to nothing suggests what it will take to make cheap batteries for electric cars.
A startup that might have a record-breaking solar cell is in danger of going out of business.
Technology is the primary cause of our skyrocketing health-care costs. It could also be the cure.
A letter to John Stuart Mill about the limits of what may be shown or said on the Web.
Japanese researchers build a gun capable of stopping speakers in mid-sentence.
A 19th-century idea might lead to cleaner cars, larger-scale renewable energy.