Antimatter

Paul Dirac developed the mathematics of electron waves and predicted the existence of the positron, a particle identical to the electron but with opposite charge. This discovery played a fundamental role in the field of subatomic physics and the study of antimatter.
 Paul Adrien Maurice Dirac England 1930 Antimatter

Paul Dirac developed the mathematics of electron waves and predicted the existence of the positron, a particle identical to the electron but with opposite charge. This discovery played a fundamental role in the field of subatomic physics and the study of antimatter.