This free printable Christmas Color By Number set is the perfect fun and creative activity for the kiddos. Keep them busy on a rainy (or snowy) day as they create their own holiday works of art with ...

A detail of the Mandelbrot set, a fractal named after Benoit Mandelbrot, the French mathematician who investigated it in the 1970s. If you were to zoom in at any point on the intricate, wiggly line, ...