From mudstones on Mars to strange gases in exoplanet atmospheres, tentative evidence for extraterrestrial life is starting to come thick and fast. But when we've found it, how will we know for sure?

Nearly 80% of Americans aged 12 and older have consumed alcohol at least once in their lives, and 10% of the population ...

Physicists have spent decades arguing over whether our universe is a fundamental reality or a kind of cosmic software, and ...