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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.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Cyanide works by making the human body unable to use oxygen.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.