Differential equations are fundamental tools in physics: they are used to describe phenomena ranging from fluid dynamics to general relativity. But when these equations become stiff (i.e. they involve ...

An unknot (also known as the trivial knot) can be drawn with any number of crossings. Any possible manipulation of a knot ...

It’s called mental inversion, and here’s how it works. Thinking forward is an automatic process. Cause, then effect. Input, then output. A to B. It feels logical—and normal to start with a conclusion, ...

We've wondered for centuries whether knowledge is latent and innate or learned and grasped through experience, and a new research project is asking the same question about AI.