Sir Isaac Newton

Sir Isaac Newton was born in woolsthorpe near Grantham, England.He is generally regarded as the most original and influential theorist in the history of science.He was born in a poor farming family.But he was not good in farming .He was sent to study at Cambridge university in 1665 .

Newton formulated the well known laws of motion.He worked on theories if light and colour He designed an astronomical telescope ti carry out astronomical observations.Newton was also a great mathematician.He invented a new branch called calculus.He used it to prove that for objects out of sphere if uniform density,the sphere behaves as if the whole of its mass is concentrated at the center. Newton Transformed the structure of physical science with his three laws of motion and the universal law of gravitation.As the keystone of the scientific revolution of seventeenth century,Newton 's work combined the work of Copernicus,Kepler,Galileo and other 's into a new powerful synthesis.

It is remarkable that through the gravitational theory could not be verified at that time  there was hardly any doubt about it 's correctness.This is because Newton based his theory on sound scientific reasoning and backed it with mathematics . This made the theory simple and elegant. These qualities are now recognised as essential requirements of a good scientific theory.