https://padlet.com/airbox605/5re3mtv6evod Soyeon Kim en-us 2017-04-05 14:14:03 UTC 2023-05-29 04:22:00 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Playcontrol.png airbox605 https://padlet.com/airbox605/5re3mtv6evod/wish/165659033 2017-04-10 13:09:13 UTC https://padlet.com/airbox605/5re3mtv6evod/wish/165659033 airbox605 https://padlet.com/airbox605/5re3mtv6evod/wish/165873337 I think the two theories that convinced me the most are the theory that claimed yawns are contagious, and the one that claimed that yawns are psycological. First of all, I yawned when my friend or family yawned. I've  exprienced it, so I'm sticking with the first theory. Lastly, the second theory, also convinced me. "...suggests that yawning is "associated with the change of a behavioral state - wakefulness to sleep, sleep to wakefulness, boredom to alertness." ]]> 2017-04-11 13:22:54 UTC https://padlet.com/airbox605/5re3mtv6evod/wish/165873337