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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 average adult has about 21 square feet of skin.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
The horizontal fraction bar was introduced by the Arabs.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.