- What is the quantum theory behind time travel?

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If the external force acting on a system is zero, the momentum of the system is zero as well. True or False? What far-reaching change came from the Crusades? What is the order of ALL college calculus courses? And please don't say calc 1 2 3 4.? Why is there no concept of conventional voltage? Find the domain and range of f(x)= square root of x-2 then +3?