Yawning Is Paranormal

Every time they do a study on yawning and why we yawn, the reasons change. In case you never bothered to read up on the subject, scientists have never been able to figure out why we yawn, or why yawning is contagious. You might be thinking, oh, we yawn because we don't have enough oxygen going to our brain, and you'd be wrong. To date, they have no reasonable explanation and no empirical evidence on why we do it or why it is contagious. 
Contagious yawning was thought to be an evolutionary indication of our empathy towards each other. Hell, even dogs share our contagious yawning. Unfortunately, recent studies have found too many things offsetting it, such as contagious yawning decreasing as we age and not having anything to do with how tired someone is. 
I just wanted you to know where your tax dollars are going and since it's outside of scientific explanation, well, it fits in the category of the paranormal. 

A haunted pig.