Color-by-numbers apps are really popular on the App Store right now, with four different apps rising to the top of the free apps chart. The apps have a combined 3.2 million downloads over the past ...

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, ...

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Didn’t you love those Paint-By-Numbers sets when you were a kid? You didn’t have to be exceptionally artistic–you just had to know your colors and the guide told you which areas of a perfectly drawn ...