In The Grammar of Science, Preface to the 2nd Edition, 1900, Karl Pearson wrote, " There are many signs that a sound idealism is surely replacing, as a basis for natural philosophy, the crude materialism of the older physicists.

* 1900 – Karl Ristenpart, German conductor ( d. 1967 )

* July 17 – Karl Wolff, German Nazi SS Officer ( b. 1900 )

* December 24 – Karl Ristenpart, German conductor ( b. 1900 )

His other notable university teachers were Christian Philipp Karl Snell ( 1806 – 1886 ) ( subjects: use of infinitesimal analysis in geometry analytical geometry of planes, analytical mechanics, optics, physical foundations of mechanics ); Hermann Karl Julius Traugott Schaeffer ( 1824 – 1900 ) ( analytical geometry, applied physics, algebraic analysis, on the telegraph and other electronic machines ); and the famous philosopher Kuno Fischer ( 1824 – 1907 ) ( Kantian and critical philosophy ).

* Karl Haas ( 1900 – 1970 )

Then Walter returned in 1900 to Berlin, where he assumed the post of Royal Prussian Conductor at the Staatsoper Unter den Linden, succeeding Franz Schalk ; his colleagues there included Richard Strauss and Karl Muck.

By 1900, Schenker was actively trying to promote his musical compositions as evidenced by correspondence with Ignaz Brüll, Karl Goldmark, Eugen d ' Albert and Ferruccio Busoni.

Its properties were first investigated by Karl Pearson in 1900.

Bernhard Heinrich Karl Martin von Bülow ( May 3, 1849 – October 28, 1929 ), named in 1905 Prince ( Fürst ) von Bülow, was a German statesman who served as Secretary of State for Foreign Affairs for three years and then as Chancellor of the German Empire from 1900 to 1909.

In 1900, Karl Brugmann derived the Common Slavic * županъ from župa " district, small administrative region ", an etymology that was accepted by many linguists.

* Materialismo storico ed economia marxistica ( 1900 ).# English edition: Historical Materialism and the Economics of Karl Marx.

Karl Friedrich Otto Wolff ( 13 May 1900 – 17 July 1984 ) was a high-ranking member of the Nazi Schutzstaffel ( SS ), ultimately holding the rank of SS-Obergruppenführer and General of the Waffen-SS.

* Zittel, Karl Alfred von ( 1900 ) Textbook on Paleontology volume 1

* WOLFF, Karl Friedrich Otto ( 1900 – 84 ) Waffen-SS General.

* Karl Doppler ( 1825 – 1900 ), composer, flute player, brother of Franz Doppler, father of Árpád Doppler

* Paul Karl Ludwig Drude ( 1900 – 1906 ) ( as Annalen der Physik )

In response to astronomical observations of low intensity reciprocity failure, Karl Schwarzschild wrote ( circa 1900 ):

Karl Ernst Krafft ( 10 May 1900 – 8 January 1945 ) was a Swiss astrologer, born in Basel.

( 1805 – 19 ), Johan Olof Wallin ( 1837 – 39 ; beloved poet and hymnist ), Karl Fredrik af Wingård ( 1839 – 51 ; politician ), Henrik Reuterdahl ( 1856 – 70 ) Anton Niklas Sundberg ( 1870 – 1900 ; outspoken and controversial ) and Nathan Söderblom ( 1914 – 1931 ; Nobel Prize winner ).

** Karl Glasisch ( 1900 – 1982 ), son of Marie-Goot.

Karl Ristenpart ( January 26, 1900 – December 24, 1967 ) was a German conductor.

This reconstruction was done from 1897 to 1900 by Karl Schäfer at the enormous cost of lo, l, lo,

* 1841 – Karl Binding, German jurist ( d. 1920 )

* 1881 – Karl Staaf, Swedish athlete ( d. 1953 )

* 1970 – Karl Unterkircher, Italian mountaineer ( d. 2008 )

* 1982 – Karl Davies, English actor

* 1905 – Karl Amadeus Hartmann, German composer ( d. 1963 )

Eastern European theorists include Pyotr Stolypin ( 1862 – 1911 ) and Alexander Chayanov ( 1888 – 1939 ) in Russia ; Adolph Wagner ( 1835 – 1917 ), and Karl Oldenberg in Germany, and Bolesław Limanowski ( 1835 – 1935 ) in Poland.

* 1891 – Karl Kobelt, Swiss politician ( d. 1968 )

* 1975 – Karl Yune, American actor

* 1945 – World War II – Fuehrerbunker: Adolf Hitler marries his longtime partner Eva Braun in a Berlin bunker and designates Admiral Karl Dönitz as his successor.

* 1966 – Karl Petter Løken, Norwegian footballer

* 1903 – German engineer Karl Jatho allegedly flies his self-made, motored gliding airplane four months before the first flight of the Wright brothers.

* 1826 – Karl Gegenbaur, German anatomist ( d. 1903 )

* 1741 – Karl Friedrich Bahrdt, German theologian ( d. 1792 )

* 1963 – Karl Beattie, English director and producer

* 1894 – Karl Böhm, Austrian conductor ( d. 1981 )

* 1873 – Austrian explorers Julius von Payer and Karl Weyprecht discover the archipelago of Franz Joseph Land in the Arctic Sea.

* 1771 – Karl Philipp Fürst zu Schwarzenberg, Austrian field marshal ( d. 1820 )

* 1979 – Karl Wolf, Lebanese-Canadian singer-songwriter, musician, and producer ( Sky )

* 1985 – Karl Reindler, Australian race car driver

* 1945 – Adolf Hitler's designated successor Hermann Göring sends him a telegram asking permission to take leadership of the Third Reich, which causes Hitler to replace him with Joseph Goebbels and Karl Dönitz.

* 1918 – Karl Ferdinand Braun, German physicist, Nobel Prize laureate ( b. 1850 )