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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.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Some organisms used as models in genetic research
HIV cycle in an infected cell: (a) latent infection; (b) active infection.
Two metal rods, one silver and the other copper, are both attached to a steam chamber, with a ...
The F1 and F2 results of crosses Sturtevant
Example of inflammation as a response to bacterial infection.
Cytological proof from Zea mays that recombination results from crossing over