Hosein Kouros-Mehr, MD, PhD, is an author and physician-scientist who has spent over two decades in cancer research and drug development. Thanks to his background, Hosein recognized the extraordinary ramifications of a recent scientific discovery: the default mode network (DMN), which encodes the human ego and influences our thoughts, emotions, and behaviors. Recognizing the profound impact of this breakthrough on self-understanding (both from clinical and personal experience), he wrote, Brea...