NPR

Does Serena Williams Have The Willpower To Ace The 'Marshmallow Test'?

In the experiment, kids get a treat. If they don't eat it for, say, 10 minutes, they're promised a second treat. What would Williams do? What do most kids do?
Cameroonian kids were part of an experiment based on the classic "marshmallow test": Put a single treat before a child but tell the child if he or she waits, say, 10 minutes, a second treat will be given.

Editor's Note: This story was originally published in 2017 and has been updated.

Tennis superstar Serena Williams clearly has conflicted feelings about marshmallows.

In a just-published interview in Vogue magazine, she and her husband talked about the so-called "marshmallow test." It's a well-known experiment to study children's self-control first run by a Stanford psychologist in the 1960s.

The idea is that kids ages 3 to 5 choose a treat — say, a marshmallow. Researchers tell the child: You can eat the treat now. But if you wait for me to return, you'll get two treats.

Then the researchers leave the

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