In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Thyroid conditions may make getting pregnant impossible.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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).
An example of a two-component regulatory system in bacteria
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones