Template:Selected anniversaries/May 27

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  1610: Factotum and regicide François Ravaillac executed.

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  1897: Physicist, academic, and Nobel Prize laureate John Cockcroft born. He will be instrumental in the development of nuclear power.

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  1931: Physicist and explorer Auguste Piccard and his assistant Paul Kipfer take off from Augsburg, Germany in their high-altitude balloon, reaching a record altitude of 15,781 m (51,775 ft). During the flight, Piccard gathers data on the upper atmosphere, including cosmic ray measurements.