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This study involved two monkeys that learned to play a computer game that gave them drops of juice when they won. The monkeys played voluntarily because they liked to gamble, Stuphorn says. The game offered two options. The first was a juice reward that was guaranteed, but usually small. The second was a gamble: It might bring a lot of juice, or none.

For the original version including any supplementary images or video, visit https://www.npr.org/sections/health-shots/2018/09/20/649846866/in-lab-turned-casino-gambling-monkeys-help-scientists-find-risk

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