Exhalation
In the story, What's Expected of Us, what is a Predictor?
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A Predictor is a new device that sends a signal back in time, and a green light always flashes exactly one second before the user pushes the button. It is impossible to fool a Predictor: if you will not press the button, the light will not flash. If you will press the button, the light always flashes.
Exhalation