[Mogollon]

Did Newton invent calculus? Don't think so.

Actually, he did. At least he was first to invent it but a man by the name of Liebwitz independently derived the calculus and published it first. Newton later published his version of calculus which turned out to be more useful in physics, engineering, etc. See the following link for details:

http://www1.umn.edu/ships/9-1/calculus.htm

[AndyJackson]

Newton later published his version of calculus which turned out to be more useful in physics, engineering, etc.Actually it is Leibnitz's notation that we use for the most part in practical applications to this day.