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A “twist” sometimes refers to an unexpected change or deviation from the norm. Early in today’s episode, you heard that scientists discovered a mysterious new ancestor by studying human DNA. To date, scientists have primarily used fossils to study our ancestors. The interesting “twist” with this new finding is that they used DNA (not the norm) and not fossils (the norm). You can also say that you gave your chocolate chip cookie recipe (the norm) a new “twist” by adding walnuts (not the norm) to them.