Newton is the greatest scientist in the world. Because:
He developed calculus and laid the foundation of advanced mathematics.
His experiment of decomposing sunlight into spectral colors laid the foundation of modern optics.
He discovered three laws of mechanics and deduced their functions, which laid the foundation of modern physics. He studied the law of universal gravitation and laid the foundation of modern astronomy.
Newton's masterpiece Principles of Mathematics is the first greatest work since ancient times. In this book, he put forward his three laws of motion of objects, his theory of universal gravitation and many other problems. As a scientist, no one can match him.