When Heisenberg met Einstein

A mere 24 years old, Werner Heisenberg (1901-76) in 1925 developed a treatment of electron behavior based solely on directly observable quantities such as the frequencies of light that atoms absorb and emit. Recovering from hay fever on the island of Heligoland, "still very uncertain about it", Heisenberg in July 1925 sent his manuscript to Max Born (18…

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