The useful way to read a lock is as a question about what the key is proving. Every mechanism below tests something slightly different, and the differences are the history.…
Almost none of these are about a single person doing a small thing. They are about what a small thing becomes when several million people do it in a year.…
Almost every unit of time you use is a measurement of something physical.
The day is the Earth turning once. The month is roughly the Moon going through its phases.…
Blood Types Were Discovered Over a Century Ago and Nobody Has Established What They Are Actually For
Most people know their blood type, treat it as a fixed personal fact like eye colour, and have never wondered what it is.
It is a molecule. Specifically, blood type…
A single phone in a shared space produced an entire social system, and everyone who lived through it remembers the same rules. Here are twelve.
1. It Lived in the…
The feature that makes a fjord a fjord is the sill at its entrance - a shallow threshold of rock and debris left where the glacier terminated. Water inside is…