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half-life
the time required for one half of the atoms of a radioactive substance to decay
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  July 27 in chemistry
  1848 - Friedrich Dorn born: discovered radon (Rn, element 86), an "emanation of radium".
  1870 - Bertram B. Boltwood born: early radioactivity and radiochemistry research.
  1881 - Hans Fischer born: research on hemin, chlorophyll, porphyrins, and related compounds; Nobel prize, 1930.
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