There is a well-documented behaviour in animals that explains the entire history of trying to keep birds off crops, and it is almost never mentioned in that context.
The behaviour…
A balloon is a very thin sheet of stretched rubber holding back a pressure it can barely contain - and almost everything it does follows from that. Here are twelve.…
Everything difficult about a watch comes from being small, portable and attached to somebody. The timekeeping principles are the same as a clock; the conditions are entirely different. Here are…
The shaft is not holding the canopy up. A sliding collar pushes struts outward, those push the ribs out, and the fabric between them is stretched tight - which is…
There is a widespread mental model of a kite that treats the string as a leash, restraining something that would otherwise escape.
That model produces a specific prediction: cut the…
There is a distinction that changes how a whole category of coastal feature should be thought about, and it comes down to whether something is a population or a structure.…