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 ondo drums and the taru barrel in his or her ensemble, in intricate drumming techniques. Heike Ondo is accompanied by a kind of shamisen called the Heike Shamisen, which has a shorter neck than most shamisens in Japan, and thus, a higher range. The narrative is quite long and is rarely ever sung in its entirety; key excerpts are chosen for shorter performances. The song is sung by a main singer accompanied by a group of singers who know when to call out the kakegoe (see below). The dance that accompanies Heike Ondo is called Heike Odori (平家踊り). It is simple