Mathematicians born on this day:
1850 : Story 
Mathematicians who died on this day:
1864 : Brianchon 
Henri Poincaré  JeanMarie Duhamel  Ludwig Wittgenstein 
Theorem of the day from Robin Whitty  Mathematician of the week 
Henri Poincaré (1854  1912)
I entered an omnibus to go to some place or other. At that moment when I put my foot on the step the idea came to me, without anything in my former thoughts seeming to have paved the way for it, that the transformations I had used to define the Fuchsian functions were identical with nonEuclidean geometry.
Another quotation by one of today's mathematicians
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This page is a copy of the one at: 
School of Mathematics and Statistics University of St Andrews, Scotland  
http://wwwhistory.mcs.standrews.ac.uk/history/Day_files/Day429.html 