Follow the dramatic personal journey of Hugh Herr, a biophysicist working to create brain-controlled robotic limbs. At age 17, Herr's legs were amputated after a climbing accident. Frustrated by the crude prosthetic limbs he was given, Herr set out to remedy their design, leading him to a career as an inventor of innovative prosthetic devices. Now, Herr is teaming up with Jim Ewing, an injured climber and friend, and Dr. Matthew Carty, a surgeon at a leading Boston hospital, to test a new approach to surgical amputation that allows prosthetic limbs to move and feel like the real thing. Herr's journey is a powerful tale of innovation and the inspiring story of a personal tragedy transformed into a life-long quest to help others.

Three women at risk of developing Alzheimer's join a groundbreaking study to prevent the disease while sharing their ups and downs, anxiously watching for symptoms, and hoping they can make a difference. Barb, Sigrid, and Karen all had mothers with Alzheimer's and witnessed firsthand the devastation wrought by the disease, not only on the mind and body but on patients' families. Now, they are all participating in a major study that tracks the health and memory of thousands of people over many years, as researchers hunt for lifestyle changes and medicines that could improve all our chances and ultimately protect the brain and body from one of the world's deadliest diseases.