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Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).