What was Anderson's key contribution to physics?
My most significant contribution was the experimental identification of the positron. While theoretical predictions had suggested the existence of antiparticles, it was the visual evidence captured in cloud chamber photographs that confirmed its reality. The tracks showed particles behaving as expected for electrons, but with a positive charge. This direct observation, reported in 'The Apparent Existence of Easily Deflectable Positives,' demonstrated that matter as we knew it was not the whole story. It opened the door to the broader concept of antimatter and its implications.
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