Emil Du Bois-Reymond
German physician and physiologist, 1818-1896
"For many years du Bois-Reymond was a well-known figure in Berlin. Acceptable at court, he used his influence for the advancement of science. Du Bois-Reymond had during his earlier years studied topics other than those of physiology and medicine, and during his later years he reviewed some of these in popular lectures to students at the University of Berlin. He owed the largest part of his fame, however, to occasional discourses on Darwinism, literature, history, and philosophy. In 1880 du Bois-Reymond delivered a famous speech to the Berlin Academy of Sciences defining seven ""world riddles"", some of which, he declared, neither science nor philosophy could ever explain."
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