Seth Neddermeyer's Muon
Working under Anderson, and using the same techniques as his mentor, Seth Neddermeyer discovered the Muon in 1936. They estimated that although being negatively charged, the muon was roughly 207 times more massive than an electron. This particle seemed to fit the properties predicted by Hideki Yukawa—as the particle that mediates the strong nuclear force. However, it was later classified within the same family of the electron, the leptons. They are not responsible for the strong nuclear force. In reality, muons don’t appear to do much—they don’t build anything stable—they just rain down on us from the heavens. I.I. Rabi famously reacted to the muon's discovery with "Who ordered that?"
Source: Neddermeyer, S. H. & Anderson, C. D. Note on the Nature of Cosmic-Ray Particles. Phys. Rev. 51, 884–886 (1937).
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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!