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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.
There are more bacteria in your mouth than there are people in the world.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.