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1840
Discovery of Praseodymium "Didymium" (Mosander) / 1885 Auer,
23 January 1840 Birth of Ernst Karl Abbe in Eisenach
1 July 1840 Birth of Robert Stawell Ball, in Dublin, Ireland
4 October 1840 Birth of Viktor Carl Knorre in Nikolajew, Ukraine
1840 Birth of Sophia Jex-Blake
1840 Birth of Lars Fredrik Nilson
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