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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
The human body produces and destroys 15 million blood cells every second.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.