Liquid helium of liquid water. Helium was first liquefied on July 10, 1908, by the Dutch physicist Heike Kamerlingh Onnes at the University of Leiden in the Netherlands. At that time, helium-3 was unknown because the mass spectrometer had not yet been invented. In more recent decades, liquid helium has been used as a cryogenic refrigerant, and liquid helium is produced commercially for use in superconducting magnets such as those used in magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), Magnetoencephalography (MEG), and experiments in physics, such as low temperature Mössbauer spectroscopy. The temperature required to produce liquid helium is low because
Heike Hennig Heike Hennig Heike Hennig (born 8 November 1966) is a German dancer, choreographer and director of the opera and dance ensemble "Heike Hennig & Co". Heike Hennig had her first dance lessons at the age of 5 years in Leipzig. In 1989, through her escape from East Germany (GDR), she was able to study modern dance, choreography and Body-Mind Centering (BMC) in Cologne and at Moving on Center – School for Participatory Arts and Research in Oakland, California; she then studied in the US with teachers such as Steve Paxton. Following that, Heike Hennig worked in Brazil and Portugal. In