His father owned a brick works near Groningen; his mother was the daughter of an architect.  In his doctoral thesis he proved that Foucault's pendulum experiment can be used to show the earth's rotation.  Always interested in cryogenics, he used the theories of compatriots Van der Waals and Lorentz to make the discoveries that earned Leyden its title as coldest place on earth.  For 10 points, name the physicist who liquefied helium.
His father owned a brick works near Groningen; his mother was the daughter of an architect.  In his doctoral thesis he proved that Foucault's pendulum experiment can be used to show the earth's rotation.  Always interested in cryogenics, he used the theories of compatriots Van der Waals and Lorentz to make the discoveries that earned Leyden its title as coldest place on earth.  For 10 points, name the physicist who liquefied helium.
His father owned a brick works near Groningen; his mother was the daughter of an architect.  
Heike Kamerlingh Onnes