Slovenes have contributed to European pool of knowledge in diverse fields of human endeavour, in sciences and the arts. Some are: the first scientist and social historian Janez Vajkard Valvazor in the seventeenth century, Jurij Vega the mathematician who authored the Book of Logarithms, Jožef Štefan the physicist, who discovered the law of heat radiation in 1879, Friderik Pregl who won the Nobel prize for the introduction of organic chemical micro-analysis in 1923, and the architect Jože Plečnik who transformed the capital Ljubljana into a rare urban phenomenon of the twentieth century.
