Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
Heike Kamerlingh Onnes (1853-1926) discovered superconductivity when studying the properties of substances at very low temperatures. He succeeded in liquifying helium by cooling it with liquid air first. In 1913 he received the Nobel prize in physics.