| http://www.w3.org/ns/prov#value | - Between 1968 and 1974, 653 4-year-olds completed a delay of gratification test, in which the children were given one treat, such as a cookie or a marshmallow, and were told that they would be given a second treat if they could wait to eat the first treat for an unspecified length of time (it ended up being 15 minutes). (A video of children trying to delay gratification can be found at http://www.y
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