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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 familiar sounds of your heart are made by the heart's valves as they open and close.
The human body produces and destroys 15 million blood cells every second.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.