Mathematicians born on this day:
1831 : Mannheim 
Mathematicians who died on this day:
1790 : Johann(II) Bernoulli 
Wilhelm Lexis  Henri Poincaré  James Lighthill 
Theorem of the day from Robin Whitty  Mathematician of the week 
Henri Poincaré (1854  1912)
Science is built up with facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house.
La Science et l'hypothèse.
Another quotation by one of today's mathematicians
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Birth and death statistics 
JOC/EFR May 2017
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/Day_files/Day717.html 