Time has always seemed like the one thing physics could count on. Matter changes, stars die, particles flicker in and out, but time keeps moving.

Imagine slipping into a multiplayer VR version of Grand Theft Auto, racing cars against players scattered across the world. You see a red Corvette speeding beside you. You immediately grip the ...

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 ...

Anyone who has seen the classic rabbit-duck optical illusion knows the magic and confusion of duality. One might see a duck facing to the left with its bill hanging slightly open or a rabbit with its ...