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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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Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

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