Quantum pigeons don’t like to share. In keeping with a mathematical concept known as the pigeonhole principle, roosting pigeons have to cram together if there are more pigeons than spots available, ...

The pigeonhole principle quickly becomes challenging, even for secondary school students. They have to apply it to an example from geometry: a straight line intersects a triangle in such a way that it ...

Solve this riddle: how do you put three pigeons into two pigeonholes, with no two pigeons ending up in the same hole? If it seems impossible, don't worry; in the classic principles of nature, at least ...