Put three groups of rats in three separate cages, each equiped with a bar. The first group of rats got a pellet every time they pressed the bar. The second group never gets a pellet, no matter how often they pressed. And the third group got pellets just once in a while.
The first group, eventually gets bored with the guaranteed reward and the rats who never get treats give up too. But the random rats will press on that bar forever, hoping each time they press that this time the MAGIC will happen, that this time they'll get lucky.
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