Source: Wikipedia
Anyone who has left a tool in the garden knows what happens to iron. A gate goes orange, a railing flakes, and given a few seasons the metal is…
There is a security feature in almost everyone's pocket that has been doing its job for over three hundred years, and almost nobody knows what it is for.
Look at…
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…
The useful way to read these is as solutions rather than as homes. Each one is addressing a specific physical problem, and the structure follows from the problem rather than…
The recurring problem is the same everywhere: sleep appears to be necessary, and being asleep is dangerous. Almost every solution below is a compromise between those two facts. Here are…