20 January

  • 1836 Birth of André-Marie Ampère, one of the discoverers of electromagnetism, after whom the unit for electric current is named
  • 1885 The rollercoaster is patented
  • 1931 Birth of David Lee, winner of the 1996 Nobel Prize along with Robert C. Richardson and Douglas Osheroff "for their discovery of superfluidity in helium-3"
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