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    Execute Code when Entering and Exiting States using Activities


    Activities are useful for anything that needs to be executed at the beginning and end of a state. Like an animation that needs to stop or an observable that needs to be unsubscribed. We'll add a completely spurious Dark Side mode for the quiz that makes all the ui elements float around the screen so that users have a more difficult time taking the quiz. Leaving Dark Side mode should return all elements to their original locations.