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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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.
Medication errors are more common among seriously ill patients than with those with minor conditions.
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.