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Irish physicist and mathematician Sir George Stokes made significant contributions to hydrodynamics, optics, and elasticity. He is best known for the Navier-Stokes equations, which describe the motion of viscous fluids, and for Stokes' theorem, which relates the circulation of a vector field to its divergence. Stokes was born in County Sligo, Ireland, in 1819 and died in Cambridge, England, in 1903.