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 1995, Heike Hennig came back to Germany. From 1998 onwards, she worked as a freelance choreographer and teacher. She instructed body- and moving-oriented teaching-methods at the "Palucca School of Dance", the "University of Leipzig" and the "Academy of Visual Arts in Leipzig" as well as in interdisciplinary workshops including anatomy, painting and choreography. In 2000, Heike Hennig founded the FZTM (Forum of Contemporary Dance and Music) in Leipzig, together with Friedrich U. Minkus, and her ensemble Heike Hennig & Co. As director she developed numerous stage pieces and interdisciplinary art projects at many different stages and art institutions in Leipzig,