If your mom was like mine she always told me "Cover your head because 80% of your body heat escapes through your head."
Mom, you're lying! Or at least you don't know the whole truth.
While some body heat does escape through the top of your head, the vast majority escapes through the "holes" in your head: IE your nose, ears and most significantly your mouth.
So the next time your mom uses this line on you, set her straight.
