The electric chair was invented by a dentist. Except for the windmills in Ireland. A hedgehog's heart beats 300 times a minute on average. Camels have three eyelids to protect themselves from blowing sand. The placement of a donkey's eyes in its head enables it to see all four feet at all times.
Human teeth are almost as hard as rocks.
A mole can dig a tunnel 300 feet long in just one night. Ancient Egyptians slept on pillows made of stone. A hummingbird weighs less than a penny. Until 1796, there was a state in the United States called Franklin. Today it's known as Tennessee.