Physicists have spent decades treating mass as something the universe simply hands to particles, a property encoded in ...

Time travel has long lived in the realm of fantasy, but a growing body of research is quietly shifting it into a serious ...

Can you chip in? As an independent nonprofit, the Internet Archive is fighting for universal access to quality information. We build and maintain all our own systems, but we don’t charge for access, ...

Wormholes are one of science fiction’s favourite cheats. Need characters to cross impossible distances? Skip years of travel?