Robert F. Kennedy Jr.'s new approach to six shots that were formerly given routinely will introduce new hurdles for getting kids immunized. And it could have a chilling effect on doctors.

This is Part 7 in a 7-part series about world poker champion and cognitive scientist Annie Duke, Ph.D., whose insights follow each question below. To read from the start of the series, see Part 1.

Every day, we’re faced with decisions; some small and fleeting, others life-defining. However, in a world that demands clarity and perfection in every choice, many of us find ourselves at a standstill ...