Image: Heike Kamerlingh Onnes and Johannes Diderik van der Waals
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Description: 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
Title: Heike Kamerlingh Onnes and Johannes Diderik van der Waals
Credit: http://www.science.uva.nl/research/itf/images/vdwaals_large.jpg
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