There is a class of behaviour that everybody performs, everybody recognises, nobody controls and nobody can explain, and yawning is the most conspicuous member of it.
It occurs in essentially…
There is a misunderstanding built into how these plants are usually described, and correcting it makes everything else about them clearer.
They are not predators in the sense of animals…
The starting point is that the front of your eye is a living surface with no blood supply, exposed to open air, that must stay optically perfect. Almost everything below…
There is an assumption embedded in ordinary language about growing old, and it is worth examining because it turns out to be misleading.
The assumption is that ageing is what…
Most complicated biological structures are alive. They are supplied with blood, monitored by nerves, maintained continuously and repaired when damaged.
A feather is none of those things. Once grown, it…
There is a category of everyday experience so ordinary that nobody thinks to ask about it, and this is a good example.
Something itches. You scratch. It stops, briefly, and…