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MATH PUZZLE: Can you replace the question mark with a number?

Jules Bordet

Died 6 Apr 1961 at age 90 (born 13 Jun 1870).Jules Jean Baptiste Vincent Bordet was a Belgian bacteriologist and immunologist who discovered (1895) the complement, a complex of proteins in the blood that causes the destruction of foreign cells in an immune response. In 1906, he isolated the bacterium responsible for whooping cough, which is named after him - Bordetella (Haemophilus) pertussis - for which he developed a vaccine. He also isolated a number of other pathogenic bacteria. For his discovery of immunity factors in blood serum, he received the Nobel Prize for Physiology or Medicine in 1919. This development was vital to the diagnosis and treatment of many dangerous contagious bacterial diseases. For example, it is the basis of the Wassermann test for syphilis.

You can own a sheep, or ron...

You can own a sheep, or fleece it.
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