#time

Your circadian rhythm keeps nearly perfect 24-hour time — but the mechanism behind it is a feedback loop that took decades to understand, and still surprises.

Radiocarbon dating works because the past leaves a measurable residue in everything that was once alive — and that residue is always decaying.

Circadian rhythms run without sunlight — which raises the question of what 'timekeeping' actually means when there's nothing left to keep time for.

A shark that lives 500 years is strange enough. What's stranger is what it means to be a creature that moves through centuries without noticing them.

Ancient Egyptian honey is still edible after 3,000 years. That's not a miracle — it's a system that never had a failure mode.

Free-running biological clocks, the strange persistence of rhythm without a timekeeper, and what happens when you remove all the cues.

The Titanic and Lusitania both sank. One took 2 hours 40 minutes. The other took 18 minutes. The difference tells you something strange about what ships — and systems — know about themselves.

A tiny jellyfish off the coast of Japan evolved its own way to keep time — and what that tells us about how many solutions to the same problem might be hiding in the world.

On irreversibility, the strange one-way nature of time's arrow, and what it means that you can break an egg but never unbreak one.