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"I have done a terrible thing, I have postulated a particle that cannot be detected." Wolfgang Pauli, born 25 April 1900.
"In principio it is impossible to prove from experiments that something is non-existent." Felix Ehrenhaft, born 24 April 1879.
"A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it." Max Planck, born 23 April 1858.
"There must be no barriers to freedom of inquiry ... There is no place for dogma in science. The scientist is free, and must be free to ask any question, to doubt any assertion, to seek for any evidence, to correct any errors." Robert Oppenheimer, born 22 April 1904.
"Divided minds, getting lost on different paths, are losing the huge advantage that would result from their combined forces." Jean-Baptiste Biot, born 21 April 1774.
"As for the Internet, I tend to have profound doubts about the value of this communication advance to science. I wonder if, in an era of the Internet, we can have somebody like Eugene Wigner. Eugene Wigner's genius manifested itself in his ability to concentrate for a long time on a single idea. If you are constantly beset by outside ideas, can you really get to the true heart of the matter? It's a very different way of doing science." Alvin Weinberg, born 20 April 1915.
"There is a beauty in discovery. There is mathematics in music, a kinship of science and poetry in the description of nature, and exquisite form in a molecule. Attempts to place different disciplines in different camps are revealed as artificial in the face of the unity of knowledge. All literate men are sustained by the philosopher, the historian, the political analyst, the economist, the scientist, the poet, the artisan and the musician." Glenn Seaborg, born 19 April 1912.