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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Active and passive immunity Active and passive immunity
Active transport of molecules Active transport of molecules
Chickenpox rash. (Centers for Disease Control and Prevention [CDC]/Ann Cain) Chickenpox rash. (Centers for Disease Control and Prevention [CDC]/Ann Cain)
The seven chakras or energy centers in Ayurvedic philosophy. Courtesy of Rev. Larissa Dahroug, ... The seven chakras or energy centers in Ayurvedic philosophy. Courtesy of Rev. Larissa Dahroug, ...
The active site cleft of lysozyme The active site cleft of lysozyme
Movement of fluids in the body is accomplished by A. osmosis, B. diffusion, or C. active transport Movement of fluids in the body is accomplished by A. osmosis, B. diffusion, or C. active transport
Video: Chemical Equilibrium between N2O4 (colorless gas) and NO2 (brown gas)

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