An investigation using scientific discovery to further our knowledge about the boundaries of human capability. How do conjoined, or 'Siamese', twins survive? Pairs of twins, some conjoined, some separated, tell their story. John Paul Ofwono is the world's tallest man. But his life is threatened by the condition that led to his size. Tourette's Syndrome drives its sufferers to bark, twitch, shout and jerk, without choice or reason - yet they often have an above average quickness of mind and artistic talents. Lightning is five times hotter than the surface of the Sun, yet one man was struck seven times before finally being killed by lightning strike. How can this happen?
