There is a satisfying category of question where something entirely familiar turns out to be unexplained, and purring belongs in it.
The sound is known to essentially everybody. It is…
Maya Linton
Almost every large cave system exists because slightly acidic water met soluble rock and took a very long time about it. The shape of what resulted records the route the…
Source: Wikipedia
The family game was one of very few occasions when everybody in a household sat round one table doing the same thing at the same time, which is why…
Two things are moving in opposite directions the whole time: heat going in, and water coming out as steam. Which one is winning at any moment determines what the food…
There is a category of behaviour that everybody recognises immediately and nobody can define precisely, which is usually a sign that something interesting is going on.
Play is obvious when…
Source: Wikipedia
There is an intuition about layered rock that is almost universal and substantially wrong.
The intuition is that layers accumulate steadily, like pages in a book, so that a…