The human body is capable of extraordinary feats; Dr. Sanjay Gupta meets the team working to break the two-hour marathon.

Dr. Sanjay Gupta explores the world of disease reversal, from Amyotrophic lateral sclerosis (ALS) to strokes to diabetes.

CNN's Dr. Sanjay Gupta investigates the science behind a new trend where doctors are prescribing video games instead of drugs - training your brain to be stronger, faster, better.

Dr. Gupta sits down with twins Scott and Mark Kelly after Scott's historic mission of spending a year in space to test the physical and mental toughness needed for a mission to Mars.

From the caves of South Africa to the CDC headquarters, monitoring the work of virus hunters and disease detectives.

Spotlighting a Blind veteran who won a gold medal at the 2012 London Paralypmics, as well as other paralympians.

From a big emphasis on screenings and preventative care,to vaccine innovations, Dr. Gupta travels to Cuba to see what it has to offer in terms of healthcare despite being a poor country.

Thanks to several breakthroughs in modern technology, disabled athletes are getting a second chance at sporting careers.

Exploring the benefits of animal-assisted therapy; lowering anxiety and stress.

With the use of a 3D printer, doctors were able to make an exact copy of young Mia Gonzalez's heart and devise a game plan for operating.

Learn how our brains play a central role in making and breaking habits; more than just willpower, but science.

Scientific proof that animals help human health.

New developments in medical treatments are explored.

John Thurman thought he'd be safe stationed at the Pentagon, in Washington D.C., not overseas in a war zone - then 9/11 happened.

Addiction's total loss of all control and obsessive cravings threatens peoples' relationships, school, work and lives.

The potential end of polio in Africa is beginning to become a reality; Sanjay Gupta is in northern Nigeria to document what was once impossible task.

Dr. Gupta examines the impact of concussions around soccer and shares the story of 16-year-old Gracie Hussey who is dealing with the effects of having two concussions from the sport.

Looking at genius and creativity.

A family ripped asunder by early-onset Alzheimer's is leading the charge to find a cure.

Exploring the gigantic floating hospital that provides health services to the U.S. Armed Forces, as well as disaster and humanitarian relief, as it sails through Central and South America on a six-month mission.

A football player's story is featured; Derrick Coleman overcomes bullying regarding his bulky hearing aids by focusing on football.

Meet the doctors attempting to remedy the debilitating effects of Tourette's syndrome from a young woman in the operating room.

The world's largest floating hospital is built inside a converted oil tanker; this U.S. Naval hospital ship has traveled the world to save lives; CNN's Dr. Sanjay Gupta is on board the USNS Comfort as it docks in Kingston, Jamaica.

James Harrison has saved more than two million babies by donating his precious life-saving blood nearly every week for last 60 years.

Uncovering the effects of too little, too much and just the right amount of sleep; how to get a better night's sleep.

Dr. Sanjay Gupta tries to unlock the secrets of living longer by learning from those who have lived the longest.

From freeze-dried food and weightless exercise, to robot surgeons, Dr. Sanjay Gupta explores how medical research in space is breaking barriers.

Addison and Cassidy Hempel were three years old when their parents realized they were slipping away; up to then, parents Hugh and Chris had been living a charmed life.

Explore the 3D printer, a discovery that could change the face of medicine forever.