How does the brain work, why does it break down, and how can it be healed? In section one of this intriguing program, doctors from Harvard Medical School and other eminent institutions study the chronic psychological stress of modern living in light of the innate fight-or-flight mechanism. In section two, a pioneer in brain imaging technology and experts from Massachusetts General Hospital and MIT describe revolutionary imaging techniques and their applications to brain tumor surgery and facial recognition research. In section three, a neurosurgeon, a neuropsychologist, and other medical professionals investigate brain trauma—"the silent epidemic"—by focusing on two cases: Pat LaFontaine, a hockey star permanently sidelined after his 6th concussion, and a survivor of a major car accident. (57 minutes)