The colors are added in, of course, with it being an electron microscope image. Another picture:
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I mean, calculus is a thorny issue in that it is mostly necessary for engineering, but is not usef for humanities. Not teach it, and STEM people will have jump of levels going college. Teach it, and humanities people will inevitably complain.
Personally, I think it is good to teach calculus just for the technical communication aspect.