He discovered the electron. He also said that atoms were uniformly packed spheres of positive matter, filled with negatively charged atoms. He won a Nobel Prize for his discovery, but his thoughts didn't last long in the news. (1 ene 1897 año – 31 mayo 1900 año)
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1 ene 1897 año
31 mayo 1900 año
~ 3 years and 4 months