Could ancient humans really have built the pyramids without extraterrestrial help? Or do such questions reveal more about modern anxieties than the past itself?

Some of the best science fiction TV shows ever premiered in the 1990s, and they are still worth watching today.

From the allegorical Dogville to the gut-wrenching Irréversible, these are the most daring films of the 21st century.

Oxygen has been the most important gas in our search for life among the cosmos thus far. On Earth, we have it in abundance ...

Debunking alien claims matters, but so does telling richer, more compelling stories about how humans shaped their own past.