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There are 20 feet of blood vessels in each square inch of human skin.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
People about to have surgery must tell their health care providers about all supplements they take.
The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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.