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American science fiction writer L. Ron Hubbard (1911 - 1986), founder of the Church of Scientology, uses his Hubbard Electrometer (patent pending) to determine whether tomatoes experience pain, 1968. His work led him to the conclusion that tomatoes 'scream when sliced'. (Photo by Scott Lauder/Evening Standard/Hulton Archive/Getty Images)

American science fiction writer L. Ron Hubbard (1911 - 1986), founder of the Church of Scientology, uses his Hubbard Electrometer (patent pending) to determine whether tomatoes experience pain, 1968. His work led him to the conclusion that tomatoes 'scream when sliced'. (Photo by Scott Lauder/Evening Standard/Hulton Archive/Getty Images)