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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.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
There are 60,000 miles of blood vessels in every adult human.
The longest a person has survived after a heart transplant is 24 years.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.