I was on On Point today with Walter Mischel, the subject of my recent New Yorker article. As usual, he was incredibly eloquent. One thing we both got a chance to emphasize was the plasticity of personality – as I mention in the article, Mischel has found a significant subset of subjects who, although they couldn’t wait for a second marshmallow as four-year olds, ended up becoming “high-delaying” adults. How’d they get better? Nobody quite knows. Nevertheless, this group is an important reminder that just because you’re an impulsive kid (and I certainly was) doesn’t mean you’re destined to always be impulsive.