He loves only cold!

If you ever wondered how a Helium dilution refrigerator was, or even if you have no idea what one is, here’s a great explanation.

Associate Professor Andrea Morello from the University of New South Wales explains how ‘zero-point motion’ makes it possible to use Helium-3 and Helium-4 in a dilution fridge to get down to only thousandths of degrees above absolute zero.
It is this technique which is used to cool the MiniGrail at Leiden so that it can act as a gravitational wave antenna.