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#### Radiometers as buttonholes: the extraordinary material legacy of William Crookes

William Crookes was a physicist, chemist, entrepreneur and spiritualist. Being a consummate experimenter he designed precision instruments of great delicacy, in particular exquisite glass vacuum tubes. The radiometer, when first exhibited in 1875, ....

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#### Paul Dirac and the religion of mathematical beauty

For the great theoretical physicist Paul Dirac FRS, the importance of mathematical beauty was 'like a religion'. Although his first papers on quantum mechanics showed an acute aesthetic awareness, he first set out his principle of mathematical beauty....

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