Scientists still don’t know why we yawn (the popular explanation that it provides oxygen to the brain is false), but according to one new theory, yawning expresses a range of emotions including interest, stress, and wanting to have sex. [Telegraph]
Scientists still don’t know why we yawn (the popular explanation that it provides oxygen to the brain is false), but according to one new theory, yawning expresses a range of emotions including interest, stress, and wanting to have sex. [Telegraph]