Why Do Some Countries Drive on the Left?
Left was the original default across most of the world. The switch to the right came from wagons without a driver's seat, and then from Napoleon and Henry Ford, and about a third of humanity never switched.
History
How today's rules, calendars and conventions got set, often by accident. Short, sourced histories of the things you assumed had always been this way.
Why Is a Week Seven Days Long?
The week is the only unit of time with no basis in astronomy. Days, months and years track real motions. Seven days tracks seven visible moving objects in the sky, and a Babylonian habit that never stopped.
More topics