Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
Modern jawless fish
Countercurrent heat exchange.
Variations on a theme: archaic Homo sapiens, Neandertal, and anatomically modern Homo sapiens skulls
Exchange of gases between lungs and blood. High concentration of CO2 in blood capillary entering the ...
Distribution of Modern Day Oceanic Plateaus and Fragments