Y-a-w-n! Ever wonder why we stretch our mouths wide open now and again in a big yawn? Do we do it because we’re tired? Or maybe bored? Scientists recently discovered that the bigger an animal’s brain, the longer the yawn.
Y-a-w-n! Ever wonder why we stretch our mouths wide open now and again in a big yawn? Do we do it because we’re tired? Or maybe bored? Scientists recently discovered that the bigger an animal’s brain, the longer the yawn.