For most people, swallowing is second nature, but how does it occur, and why do some people have difficulty with it?

To come up with a result as weird as this, you need to be using some equally mind-bending math – and indeed, this paradox comes to us from the world of set theoretic geometry. If that’s not familiar ...

Scientists update Hamilton’s rule with powerful new math, revealing the many ways altruism and cooperation can thrive in ...

For most people, swallowing is second nature, but how does it occur, and why do some people have difficulty with it?