Yawning
Get a group of your friends around to your house and then do a big yawn and see how many people yawn after you.
Did you know that yawns are contagious
Reading about yawns will make you yawn
Nobody actually knows why we yawn. For a while Scientists believed that you yawned when there was too much carbon dioxide and not enough oxygen in your blood.
The average yawn lasts about 6 seconds.
Blind people yawn more after hearing an audio tape of people yawning.
Olympic athletes often yawn before a competition
Have I made you yawn yet? If I have, it’s simply by the power of suggestion.
