Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Cyanide works by making the human body unable to use oxygen.
The development of ancestral tetrapods.
Several common functional groups in a single biomolecule
Tooth development and eruption are commonly used to assess age in the subadult skeleton. Deciduous (