What did Isaac Newton invent?

Answer 1

Isaac newton published three books and invented the Newtonian reflecting telescope, a significant improvement on previous reflecting telescopes.

Isaac Newton formulated the laws of universal gravitation and motion.

He established the modern study of optics.

He invented differential calculus at the same time as the German mathematician Gottfried Wilhelm Leibniz (independently it is now believed but there was much controversy on this subject at the time.)

He came up with his theory on gravity while looking at an apple tree outside his window. He saw an apple fall from the tree (The idea that it fell on his head was invented be cartoonists and is untrue) and he was encouraged by the experience to investigate the cause behind it.
the little indents around a coins edge were designed by him to stop people from carving away at coins when they were made of valiable metal. a lot of his life was spent dealing with turning led to gold. not to helpful sorry but it is interesting.

Answer 2

A great many things, but usually when people want only one answer, they are looking for calculus (though there is some debate over whether this was him or Gottfried Leibniz).

Answer 3

Isaac Newton is best known for his work in physics and mathematics. He formulated the laws of motion and universal gravitation. He also made significant contributions to calculus and optics.