Willem Hendrik Keesom
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Willem Hendrik Keesom was a Dutch scientist who in 1926 invented a method to solidify helium.

He had been student of Heike Kamerlingh Onnes, who had been the first to liquefy helium (a feat for which Onnes received a Nobel Prize).

The original article can be found at: http://en.wikipedia.org/wiki/Willem_Hendrik_Keesom.
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