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Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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This advertisement from about 1885 represents an early stage of capitalism when individuals were ... This advertisement from about 1885 represents an early stage of capitalism when individuals were ...
Prevalence of drug use in the United States. Figures are based on a survey of people 12 years of age ... Prevalence of drug use in the United States. Figures are based on a survey of people 12 years of age ...
People who are color-blind see colors differently. (a) Those with normal vision see the red leaves. People who are color-blind see colors differently. (a) Those with normal vision see the red leaves.
Video: Structures that affect circulation - heart and systolic/diastolic BP

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