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Author Question: Bell Telephone Laboratories invented the ________, which replaced the vacuum tube. (Read 310 times) |
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Your heart beats over 36 million times a year.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.