Calculus is how we know everything about everything, except sex, maybe.
It is also a name for the page and a half of indecipherable foreplay used in university physics textbooks before they give you the formula for something.
Engineering student: I forgot the formula for the volume of a sphere, but I was able to figure it out from the area of a circle using calculus.
Non-engineering student: I looked in the back of the textbook.
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