Most visible human variation is complicated. Height, skin tone, hair texture and facial structure each involve many genes contributing small effects, which is why they vary continuously rather than falling…
The useful frame is that you are not protecting the fruit. You are making conditions that the organisms which would spoil it cannot tolerate, and there are only about five…
The single most useful realisation is that you cannot turn coals down. Every control available is about moving the food or changing what is between it and the heat. Here…
The single fact behind most of this is that the sun is not a point of light. It is a disc, roughly half a degree across, and almost everything strange…
The interesting thing about an egg is how many contradictory requirements it satisfies simultaneously. Strong and breakable, sealed and breathing, hidden and identifiable. Here are sixteen.
1. It Has to…
The governing constraint is that heat is gained by volume and lost through surface, so the ratio between the two determines the entire problem. Almost everything below follows from that.…