Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
Did you know?
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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The average adult has about 21 square feet of skin.
Map of Mars from Hubble Space Telescope as seen near the 1999 opposition. (North top)
Space
The Hubble Space Telescope
Cultures Ideal Body Types
Telescope
The CRISPR/Cas system mediates an adaptive immune response in prokaryotes