Why is a yawn so contagious? Before you find that out, have a little fun with the yawn-o-meter. Check out how long you can last without yawning? Just for the record, I yawned at No 2 itself!
Original video here
Why is a yawn so contagious? Before you find that out, have a little fun with the yawn-o-meter. Check out how long you can last without yawning? Just for the record, I yawned at No 2 itself!
Original video here