Bohr left Copenhagen to seek J. J. Thomson at Cambridge. While studying cathode rays, Thomson postulated the existence of what he called "corpuscles," later to be renamed "electrons" by H. A. Lorentz. This 1897 discovery ignited research worldwide, including Bohr's own, and soon the traditional picture of the atom as a solid ball was replaced by a picture that focused on the dynamic between electrons and their positively charged counterparts, protons. There was no doubt in Bohr's mind that his path lay with Thomson at Cambridge, where he headed the illustrious Cavendish laboratory. He hurried to Cambridge as soon as was feasible and arranged a meeting. Thomson was cordial and showed some interest in the young man's work. Language barriers made their communication difficult, and Bohr tried to capture the revered man's attention by immediately pointing to some errors he'd found in Thomson's work. While this may or
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