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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

The structure of the rib cage. The structure of the rib cage.
cell structure cell structure
Basic structure of an autonomic pathway. Basic structure of an autonomic pathway.
Structure of a Sterol Rather than being made from fatty acids Structure of a Sterol Rather than being made from fatty acids
Structure of immunoglobulin molecules Structure of immunoglobulin molecules
Structure of roots Structure of roots
Video: Transcription—A molecular view

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