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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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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.

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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

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Vaccines prevent between 2.5 and 4 million deaths every year.

Flynn Effect IQ scores have risen across developed countries in recent decades. Source: Flynn (199 Flynn Effect IQ scores have risen across developed countries in recent decades. Source: Flynn (199
Inverse Relation Between IQ and Disease. Could this explain the Flynn effect? Inverse Relation Between IQ and Disease. Could this explain the Flynn effect?
Avoiding High-Pollution Exercise Times Avoiding High-Pollution Exercise Times
A gasoline direct-injection system injects fuel under high pressure directly into the combustion ... A gasoline direct-injection system injects fuel under high pressure directly into the combustion ...
Graduating High School Graduating High School
High in the Andes, a scientist measures the stride of a carnivorous dinosaur High in the Andes, a scientist measures the stride of a carnivorous dinosaur
Video: Properties of macromolecules (Explained with No Audio)

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