Many people reach the end of their lives wishing they could change the past. Turning back the clock is impossible, but Dr. Harley Rotbart offers sage guidance to help us appreciate what we have in our lives, and take greater pride in what we’ve done with our lives — without spending precious time and energy wishing things had turned out differently. Woven into his timeless message are especially timely observations on the COVID-19 pandemic, from his expert perspective as an infectious diseases physician, including coping mechanisms and paths for going forward as individuals and as a society. He is Professor and Vice-Chair Emeritus of Pediatrics at the University of Colorado School of Medicine and the author of more than 175 medical and scientific publications, including five previous books for general audiences.