Yawn

Today's interesting fact has to do with yawning.

Yawning is contagious in humans and other primates.

If any primate sees another yawn, the odds are it will also yawn.

But with humans, the contagiousness of yawning greater.

Not only can we humans yawn when we see other humans, dogs, cats, or primates yawn, we also can start yawning if we read about it, write about it or even just think about yawning.

As no other animals has successfully learnt to read, humans are unique.