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Keywords: Heike Kamerlingh Onnes and Johannes Diderik van der Waals.jpg Johannes Diderik van der Waals right and Heike Kamerlingh Onnes in Leiden in front of the helium- ˜liquefactor ™ http //www science uva nl/research/itf/history php http //www science uva nl/research/itf/images/vdwaals_large jpg 1908 PD by age PD-old Johannes Diderik van der Waals 1908 Heike Kamerlingh Onnes 1908 |