This has been a matter of debate for quite some time, but it is rather easy to resolve.
The question of whether Newton or Leibniz invented Calculus.
No, the answer is simple, Newton invented physics, why because he was the more practical of the two, he could not have invented a math, but rather, a way of describing motion, that was also mathematical.
Leibniz, however, was a not concerned with the physical at all, but rather the domain of pure thought, the locus of mathematical ideas and construction. Therefore it is obvious that the math belongs to him.
Give to the object its maker, and thoughts to the owner.