Subject
Time that runs faster at your head than your feet, a force that comes from empty space, an atom you can freeze just by watching it. Every one of them measured.
13 essays
PhysicsPut two uncharged metal plates a hair apart in a vacuum and they get measurably shoved together — harder the closer they get. Hendrik Casimir predicted it in 1948, and it was confirmed to a few percent by Steven Lamoreaux in 1997 and sharpened a year later.
PhysicsA friend seals herself in a lab and measures a quantum particle. She gets a definite result — a fact.
PhysicsEveryone's heard that hot water can freeze faster than cold — the Mpemba effect. Here's the honest version: in ordinary water it's genuinely disputed, a tangle of evaporation and convection that careful experiments often can't reproduce.
PhysicsFor all of history, a mirror could only reflect you in space — left becomes right, but the moment stays the same. In 2023, physicists built the other kind: a mirror in time.
PhysicsA watched pot never boils — it's just a saying. Except in the quantum world, it's literally true.
PhysicsDelete a file, empty the trash, and you do something with a fundamental, unavoidable physical cost: you warm the universe. Just slightly — but never zero.
PhysicsEvery liquid you have ever handled has one thing in common: it stays where you pour it. Superfluid helium doesn't.
PhysicsRight now, 93 million miles away, the Sun is doing something the laws of classical physics say it cannot do. Its core is far too cold to fuse hydrogen — the protons simply don't have the energy to overcome their own electric repulsion.
PhysicsPut your hand flat on the nearest surface and press down. You can feel it — solid, cool, undeniably there.
PhysicsThere is a sentence physicists can now say out loud, backed by a Nobel Prize, that sounds like a fever dream: the universe is not locally real. "Local" means nothing can influence anything faster than light.
PhysicsSay the word "now." It feels like a single instant the whole universe shares. It isn't.
PhysicsRight now, time is passing faster at your head than at your feet. Not as a feeling.
