Mathematicians born on this day:
1849 : Klein 
Mathematicians who died on this day:
1840 : Poisson 
Felix Klein  Andrei Nikolaevich Kolmogorov  Siméon Poisson 
Theorem of the day from Robin Whitty  Mathematician of the week 
Felix Klein (1849  1925)
Everyone knows what a curve is, until he has studied enough mathematics to become confused through the countless number of possible exceptions.
Quoted in C B Boyer, The Invention of Analytic Geometry, Scientific American 180 (1949)
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/Day425.html 