The human heart creates enough pressure when it pumps out to the body to squirt blood 30 feet. Bats always turn left when exiting a cave. Our eyes are always the same size from birth, but our nose and ears never stop growing. All polar bears are left-handed. A snail can sleep for three years. Elephants are the only animals that can't jump. Only one person in two billion will live to be 116 or older.