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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Chromosome territories in the cell nucleus Chromosome territories in the cell nucleus
A molecular model showing chromosome territories in the cell nucleus of humans A molecular model showing chromosome territories in the cell nucleus of humans
The nucleolus (arrow) is a prominent structure in the nucleus The nucleolus (arrow) is a prominent structure in the nucleus
Chromatin fibers characteristic of the interphase nucleus Chromatin fibers characteristic of the interphase nucleus
A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta-minus decay. How much energy (in ... A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta-minus decay. How much energy (in ...
In 1994 a team of German physicists created an atom of Element 110. If the atom In 1994 a team of German physicists created an atom of Element 110. If the atom
Video: Hydrogen bonds - role in the body

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