Over 20 countries have high-speed train travel, carrying 1.6 billion passengers a year. The United States is lagging behind.
Airlines have already flown planes fueled with biofuel-petroleum mixes, and more are coming.
When Google runs a smart city, who owns the data?
In the late 1800s, electric boats were a promising new technology. They are now enjoying a revival.
Gas was in fact one of the first readily available fuels, and shaped spaces and politics in Regency-era London.
Early in the 20th century, Cosmism was all the rage in Russia, inspiring a utopian and mystical view of interstellar travel.
Today we call anyone with a flip phone a Luddite. But the term has radical origins.
Apple's stranglehold on the App Store is problematic. Our technology columnist explains why.
Two of the scientists on the huge team that eventually captured the world's first image of a black hole discuss the particular challenges of the task.
If you're concerned about the internet's effects on the world and on yourself, unplugging might not be the answer.