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
What Katy Did as Dorry, Bryn McAuley as Joanna, and Dean Stockwell as "Tramp". A 1972 UK movie adaptation, "Katy", starred Clare Walker, and the 1962 eight-part TV series made in the UK, also called "Katy", featured rising star Susan Hampshire in the title role. In 2015, author Jacqueline Wilson wrote her novel "Katy", which is a modern retelling of "What Katy Did". The August 2016 edition of Storytime featured a new illustrated adaptation with illustrations by Italian artist Marco Guadalupi. "What Katy Did" was followed by four sequels: "What Katy Did at School" in which Katy and Clover attend the fictional Hillsover