In Chicago last week Arthur Holly Compton, one of the world's most famed cosmic ray experts, startled a gathering of some 100 distinguished physicists by retracting a theory which he had espoused two and a half years ago, and by putting forth a new one in its place. Cosmic rays are electrified particles which constantly bombard Earth from every direction. It is estimated that about 30 shoot through every human body every second. They have energies higher than any particles ever propelled by man-made machines— energies, in some cases, measured in hundreds of billions...
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