About Christiaen Huygens
He was a famous mathematician, physicist and astronomer. He invented the pendulum clock, the principal of the steamengine and a gunpowder engine. Jan Jansz Stampioen was for two years (1643-1645) his teacher for mathematics.
Huygens achieved note for his argument that light consists of waves, now known as the Huygens–Fresnel principle, which two centuries later became instrumental in the understanding of wave-particle duality. He generally receives credit for his discovery of the centrifugal force, the laws for collision of bodies, for his role in the development of modern calculus and his original observations on sound perception. See: Wikipedia-Duch ; Wikipedia-English