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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

The Type C killer whale The Type C killer whale
Injecting an IV push (bolus) medication; C, another type of needleless syringe and needleless IV acc Injecting an IV push (bolus) medication; C, another type of needleless syringe and needleless IV acc
Uticaria, a skin rash caused by type I hypersensitivity. Uticaria, a skin rash caused by type I hypersensitivity.
Basic molecular mechanisms of delayed-type hypersensitivity. Basic molecular mechanisms of delayed-type hypersensitivity.
Patient diagnosed with type 2 diabetes mellitus. Periodontal examination revealed deep periodontal ... Patient diagnosed with type 2 diabetes mellitus. Periodontal examination revealed deep periodontal ...
Type III curve. Mortality is highest early in life. Data for a desert shrub (Cleome droserifolia). Type III curve. Mortality is highest early in life. Data for a desert shrub (Cleome droserifolia).
Video: Brief Summary on Photosynthesis - Animation

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