Newsreels told the story of World War II, and the early still photography of Matthew Brady chronicled the horrors of the Civil War. But with the American Revolution, which began 250 years ago this ...

Instead of one massive, fiery birth like the Big Bang ... negative density remains hard to explain in real-world terms. The newer version drops that piece while still solving the same puzzles ...

Teams of astronomers have devised clever ways to reduce or eliminate interference, featuring arrays scattered around the most desolate deserts in the world ... ages and the birth of the first ...