Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
The human forebrain.
Species-rich floras of chalk grassland compared to species-poor floras of acid soils.
Eight weeks old human embryo
The birth weight of human infants is tightly constrained by natural selection.
The human diencephalon.
Human mtDNA molecule, showing the locations of HVS I and II regions relative to other mtDNA genes