Three years after a person quits smoking, their chance of having a heart attack is the same as someone who has never smoked before.
The kidneys filter over 400 gallons of blood each day.
Constipation is caused when too much water is absorbed in the large intestine and poops become dry.
An adult has 206 bones, and a newborn has 300.
The loss of eyelashes is referred to as madarosis.
Just behind the pupil is a lens. It is round and flat. It is thicker toward the middle.
Pain signals travel along hour nerves at 50 feet per second.
The average human head weighs about eight pounds.
Native Americans used to use pumpkin seeds for medicine.
The early occurrence of a fetus yawning is at eleven weeks after conception.