We’ve always been told that if you watch a chameleon closely behind any background, it flickers its colors and slips into invisibility mode. But boy, have we been wrong all along! Those mesmerizing ...

What a great question, Ikechukwu! It doesn’t have a simple answer, though: yes, chameleons do change color when they sleep, but we think it happens in a different way to when they’re awake. People ...