There was one famous experiment, conducted in the 1960s, in which scientists at Stanford had tested the willpower of a group of four-year-olds. The kids were brought into a room and presented with a selection of treats, including marshmallows.
This is the famous ‘marshmallow experiment’, which has been repeated dozens of times. If you want to see some great video of repetitions of this experiment, search the internet for “Marshmallow test.” The footage is wonderful.
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