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 most informative thing in any orchard is the spacing, because it tells you how big the trees are meant to get and how the fruit is meant to come…
The coach differs from every other mode in one respect: it travels through the landscape at ground level, stopping at ordinary places, rather than passing over or under it. Here…
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…