In the late 1960s, Walter Mischel conducted a series of experiments on delayed gratification in preschoolers that became known as the Marshmallow Test. A recent New Yorker article
talks about the eventual path that his research took and its wider implications. New research
points to specific differences in brain activity between people with good self control and people with poor self control.
Promising scientific findings aside, it's the (adorable) movie
re-enactment of the marshmallow tests that is making news recently.