1.The nail on the middle finger grows faster than the other fingernails.2.The strongest muscle in the body is the human tongue.3.Your eyes remain the same size after birth but your nose and ears never stop growing.4.A man has approximately 6.8 liters of blood in the body while women have approximately 5 liters.5.Women's hearts beat faster than men's.6.The brain is more active at night than during the day. Scientists don't know yet why this is.