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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.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Excessive alcohol use costs the country approximately $235 billion every year.

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