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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People about to have surgery must tell their health care providers about all supplements they take.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are 20 feet of blood vessels in each square inch of human skin.
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Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.
Synaptic response of photoreceptors to dark and light.