Leiden University at the university. The learning and reputation of Jacobus Gronovius, Herman Boerhaave, Tiberius Hemsterhuis and David Ruhnken, among others, enabled Leiden to maintain its reputation for excellence down to the end of the 18th century. At the end of the nineteenth century, Leiden University again became one of Europe's leading universities. At the world’s first university low-temperature laboratory, professor Heike Kamerlingh Onnes achieved temperatures of only one degree above absolute zero of −273 degrees Celsius. In 1908 he was also the first to succeed in liquifying helium and can be credited with the discovery of the superconductivity in metals. The
Heike Matthiesen at festivals and in guitar concert series and a juror in national and international competitions. Heike Matthiesen is especially passioned about the music of female composers. Heike Matthiesen represents a new generation of classical musician, communicative, open for new media and an avid ambassador for classical music on all relevant social media platforms. Solo: Heike Matthiesen Heike Matthiesen (born 27 June 1969) is one of Germany's leading classical guitarists whose virtuosity and spirited performance, coupled with a charismatic stage presence, are regularly highlighted by the press. Heike Matthiesen was born in Braunschweig, into a family of classical musicians. From early