I picked up a book the other day at my favorite thrift store. The book is You Asked For It! Strange but true answers to 99 wacky questions by Marg Meikle. I own nothing just want to share.
The average human head weighs about 7.5% of a person's body's weight.
Your head has 22 bones - the cranium, which protects the brain, has 3 bones, the face, 14 bones.
So when you get tired holding your head up high, you know why. Its heavy!