Isaac Newton developed the law of gravitation, calculus, and… Isaac Newton developed the law of gravitation, calculus, and three laws of motion at the age of 23 all during the 2 years that Cambridge was closed due to plague.Source: Weird Facts Interesting Facts Related posts:The tree where Isaac Newton discovered gravity is still alive… When Isaac Newton was asked why the planets’ orbits are… Isaac Newton developed the law of gravitation, calculus, and… When Isaac Newton was asked why the planet’s orbits are…