Imagine a clock that doesn’t have electricity, but its hands and gears spin on their own for all eternity. In a new study, physicists at CU Boulder have used liquid crystals, the same materials that ...

There's been many a time machine in science fiction stories, but Back to the Future's DeLorean beats them all.

Celery and Uncle Zucchini race. / Jet tests his experimental time machine. Celery competes against her brother, Uncle Zucchini, in an "Earthie-style race with a winner"! / Jet uses his Bortronian ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...