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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

Juvenile American alligator swimming, showing the distinctive yellow striping found on juveniles Juvenile American alligator swimming, showing the distinctive yellow striping found on juveniles
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Probability of Major Depression as a Function of 5-HTT Allele and Levels of Maltreatment ... Probability of Major Depression as a Function of 5-HTT Allele and Levels of Maltreatment ...
Factors that Influence Pulse Rate Factors that Influence Pulse Rate
Influence of substrate concentration on the rate of an enzyme-catalyzed reaction. Influence of substrate concentration on the rate of an enzyme-catalyzed reaction.
Video: Neuron Type Animation

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