This document provides an overview of key concepts from the book "Brain Rules" by John Medina:
(1) The human brain evolved to solve problems related to survival in an unstable outdoor environment and to do so in constant motion.
(2) Symbolic representation allowed for language, writing, art and other skills that helped humans not just survive but thrive.
(3) Humans adapted to variation itself by developing the ability to rapidly solve new problems, learn from mistakes, and store knowledge for future problem-solving through improvisation.