Have you ever tried to do the brainteaser below, where you have to connect the dots to make the outline of a house in one continuous stroke without going back over your lines? Or perhaps you've ...

For years, a simple question has haunted Máté Matolcsi, a professor at the Budapest University of Technology and Economics. How much of an infinite plane can you color in while making sure that no two ...

Educational apps always seem impressive at first. Parents see the bright screens, the cheerful voices, and the promises about faster learning. It feels like these apps should help kids pick up letters ...