Bella can eat one cookie now or two cookies later...
Based on Walter Mischel's Marshmallow experiment, in which four year-olds were offered a marshmallow, which they could eat if they wanted. However, they were also told that if they waited until the researcher came back into the room, they would be given a second marshmallow. Kids who could successfully defer their gratification (about 1 in 3) were found to later have higher SAT scores at 18 years of age.
See a similar experiment on big sister, two and a half years ago: http://www.youtube.com/watch?v=gb2_Ro8OGig
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