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Did you know?

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

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Olfactory structures in the human nose. Olfactory structures in the human nose.
24 weeks old human fetus 24 weeks old human fetus
The S-curve in the human vertebral column--a result of the evolution of bipedality--makes humans hig The S-curve in the human vertebral column--a result of the evolution of bipedality--makes humans hig
A Simplified Model of Information Flow in Human Memory A Simplified Model of Information Flow in Human Memory
Stages of gene regulation in human cells Stages of gene regulation in human cells
Major features of human genome Major features of human genome
Video: HDL (high density lipoprotein)

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