Status Updates From The Making of the Atomic Bomb

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In the 1920’s horses were disappearing from cities. At the same time Niel Bohrs predicted the chemistry of Hafnium before it was discovered and named by its atomic number and location on the periodic table of elements. An effective model supported by observation and taught to every chemistry student today. I don’t begin to understand how he realized it from spectroscopy and mathematics. Like Newton’s Calculus.