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Title: paul dirac
Caption: Paul Dirac, in the course of reconciling quantum theory with special relativity, predicted the existance of antimatter. Shortly thereafter, the anti-electron, or positron, was discovered. New York Public LIbrary Picture Collection.
Credit: Album / SCIENCE SOURCE
Image size: 3451 × 4179 px | 41.3 MB
Print size: 29.2 × 35.4 cm | 1358.7 × 1645.3 in (300 dpi)