There is a problem in the design of any keyboard instrument that strikes rather than plucks, and solving it took a long time.
The problem is that a string only…
Three variables produce nearly every dune shape there is: how much sand there is, how many directions the wind blows from, and whether vegetation is holding anything down. Here are…
There is a common assumption that different teas come from different plants, in the way that apples and pears come from different trees.
They do not. The overwhelming majority of…
There is a failure mode in any signalling system that is worth more attention than the system itself, and lighthouses have an obvious one.
A light works by being seen.…
There is a category of invention that is hard to recognise as an invention because it seems like a description of how things obviously are.
Alphabetical order is the clearest…
There is a structure that appears on rivers everywhere, that most people cannot name correctly, and that does something quite different from what it appears to do.
A weir looks…
