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Computing a series sumHow to prove $sum_{n=0}^{infty} frac{n^2}{2^n} = 6$?Writing an infinite series as the...

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Can my American children re-enter the USA by International flight with a passport card? Being that their passport book has expired Do people who work at research institutes consider themselves "academics"? Understanding Deutch's Algorithm Can I say: "When was your train leaving?" if the train leaves in the future? How to continually let my readers know what time it is in my story, in an organic way? How to redirect stdout to a file, and stdout+stderr to another one? Why is the Advance Variation considered strong vs the Caro-Kann but not vs the Scandinavian? How to rename multiple files in a directory at the same time Meaning of "legitimate...