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Science Friday is always fun, though the Meiosis v Mitosis video contained at least a couple of errors. One was noted on screen, about the wall of the nucleus. Another was grammar: several times, the presenter confused "nuclei" (plural) with "nucleus" (singular). Still, it's good to review meiosis vs mitosis, and it reminds me of an Italian joke about an accountant who worked his whole life dealing with credits (left side of the ledger) and debits (right side of the ledger). After he died, the office workers emptying his desk found the top drawer contained a reminder: "credit is by the window [left side of the office], debit is by the door [right side of the office]." There are probably geologists with pictures of stalactites and stalagmites, for the same reason.