Word: physicist
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...suddenly, the cosmological term was unnecessary. Einstein's instincts had been right, after all. His great blunder had been to doubt himself, and in 1931, during a visit to Caltech, the great and grateful physicist traveled to the top of Mount Wilson to see the telescope and thank Hubble personally for delivering him from folly...
...medical imaging, nuclear reactors, atom and hydrogen bombs, radio and television, transistors, computers and lasers. Physical knowledge increased so rapidly after 1900 that theory and experiment soon divided into separate specialties. Enrico Fermi, a supremely self-assured Italian American born in Rome in 1901, was the last great physicist to bridge the gap. His theory of beta decay introduced the last of the four basic forces known in nature (gravity, electromagnetism and, operating within the nucleus of the atom, the strong force and Fermi's "weak force"). He also co-invented and designed the first man-made nuclear reactor, starting...
...Austrian-American physicist Victor Hess detects radiation coming from outer space; it is later dubbed cosmic rays...
...British physicist Ernest Rutherford artificially splits an atom...
...French physicist Louis de Broglie describes his theory that all matter behaves as both a particle and a wave, just as light does; this notion will lead to the electron microscope...