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The notion that matter on the atomic scale might have the properties of a wave was rooted in a proposal Einstein had made 20 years before. Einstein had suggested that light of short wavelengths might under some conditions be observed to behave as if it were composed of particles.
http://www.britannica.com/EBchecked/topic/80727/Louis-Victor-7e-duke-de-Broglie -
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A positron is a postitively charged electron. In 1933, he proved that positrons were emitted by gamma rays.
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His discovery of positrons led to the development of the atomic bomb.
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