- Is there any practical use for Calculus?

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How to participate in Saturday Market? What happens if a black hole made from antimatter collided with one made from matter? How would you prepare 300ml of a 0.6M solution from a 4M stock solution? Tell me an antidepressant pill that actually works. Or a list of pills giving relative benefit.? Why does sqrt(4)-sqrt(16) not equal two? If sqrt(4) equals +-2 and sqrt(16) equals +-4, then could you not say -2+4 = 2?