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Filip Ginder
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Jean le Rond D'AlembertBorn 16 Nov 1717; died 29 Oct 1783 at age 65. French mathematician known for his work in various fields of applied mathematics, in particular dynamics. In 1743 he published his Traité de dynamique (Treatise on Dynamics). The d'Alembert principle extends Newton's third law of motion, that Newton's law holds not only for fixed bodies but also for free moving bodies. D'Alembert also wrote on fluid dynamics, the theory of winds, the properties of vibrating strings and conducted experiments on the properties of sound . His most significant purely mathematical innovation was his invention and development of the theory of partial differential equations. He published eight volumes of mathematical studies (176180). He was editor of the mathematical and scientific articles for Denis Diderot's Encyclopédie. 
Turbulent Times
A plane hit a patch of severe turbulence and the passengers were holding on tight as it rocked and reeled through the night. A little old lady turned to a minister who was sitting behind her and said, "You're a man of God. Can't you do something about this?"
He replied, "Sorry, I can't. I'm in sales, not management."