Those of us who grew up coloring remember the cardinal rule: stay inside the lines. But those who pick up the Patterns of the Universe coloring book have to stay in the sines (and cosines and tangents ...

Adult coloring books came in like a wrecking ball in 2015, and it seems like everyone's a fan. Not just for kids anymore, coloring has been said to help with stress, anxiety, and focus. Amazon sells ...

Gabe Coeli of Portland, Ore., is devotee of zen meditation. But in the middle of a busy work day, he often takes a shortcut to mindfulness and stress relief by doing a little coloring. His assistant ...