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, ...

Though the craze for coloring books for grown-ups has recently drawn many adults back to a hobby that had been seen as something for kids, it turns out that adult coloring books are actually how the ...