Paul Ulrich Villard (1860-1934) was a French chemist and physicist known for his work in the fields of radioactivity and radiation. He is particularly noted for his discovery of gamma rays in 1900, which he identified as a form of electromagnetic radiation distinct from alpha and beta rays, which were previously known forms of radiation. Villard's contributions to the understanding of radioactive materials and their emissions laid important groundwork for future research in nuclear physics and related disciplines.
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