A couple of years ago, a group of entrepreneurs successfully Kickstarted a little something known as the Chameleon Pen. In a nutshell, it's an art pen that changes color tone as you draw – for example ...

The popular belief is that chameleons change color solely to disappear into their surroundings. While camouflage does play a part, it is not the only or even the primary reason. Chameleons also alter ...