1900
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Events
- October 3 – The Wright brothers begin their first manned glider experimental flights at Kitty Hawk, North Carolina and failed for the first few attempts.
- October 19 – Max Planck produces "Planck's Law of Black-Body Radiation and Planck Constant", marking the birth of quantum physics.
- December 20 – Michel Giacobini in France discovers a comet (rediscovered by Ernst Zinner in 1913), named the Giacobini-Zinner comet.
- Unknown Date – Gamma rays are discovered by Paul Villard while studying uranium decay.
- Unknown Date – Karl Landsteiner makes the first discovery of blood types, identifying the ABO blood group system.
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