Some of the most satisfying number puzzles require little mathematical know-how. In fact, cracking the one below calls for thinking that is quite nonmathematical. I don’t know where or when I first ...

Move three matchsticks around so that the coin is inside the house. You cannot move the coin, and the house must have exactly the same shape as before.

In new research posted last month to the ArXiV preprint server (meaning the work has not yet been peer-reviewed) biophysics researcher Madeleine Bonsma-Fisher, Ph.D., and her family explore a vital ...