Why do our faces go red and hot when we feel embarrassed, ashamed or guilty? No other species is known to do this, and yet most humans can recall experiencing something that made them blush at one time or another.

In this quick and illuminating video, ASAPScience's Mitchell Moffit and Gregory Brown deliver a crash course on the mysterious science of blushing — a physiological and evolutionary riddle that Charles Darwin once called "the most peculiar and most human of all expressions."

[ASAPScience]