Hendrika Johanna van Leeuwen was a Dutch physicist known for her early contributions to the theory of magnetism. She studied at Leiden University under the guidance of Hendrik Antoon Lorentz, obtaining her doctorate in 1919. Her thesis explained why magnetism is an essentially quantum mechanical effect, a result now referred to as the Bohr–Van Leeuwen theorem. She continued to investigate magnetic materials at the \"Technische Hogeschool Delft\", first as \"assistant\" between September 1920 and April 1947, and then she was promoted to \"lector in de theoretische en toegepaste natuurkunde\".
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{"fact":"In the 1930s, two Russian biologists discovered that color change in Siamese kittens depend on their body temperature. Siamese cats carry albino genes that work only when the body temperature is above 98\u00b0 F. If these kittens are left in a very warm room, their points won\u2019t darken and they will stay a creamy white.","length":315}