Watch Human Body: Pushing the Limits Season 1 Episode 2 Online

Sight is the king of the senses. More than 80 percent of what we know of the world comes through our eyes -- without our sight we're lost. In this episode, we reveal the inner workings of our visual system as they've never been seen before, vividly confirming that ancient human adaptations prove no less crucial in modern life. The astounding hidden powers in our eyes are brought to life by true stories including: * A patrolman relies on the power of sight as he risks his life in a high-speed chase of a murder suspect. * A firefighter crawls through thick smoke in a burning building to seek survivors using innate night vision and clues decoded by his brain's vision center. * A lifeguard applies his remarkable skills of pattern recognition to spot one drowning man amid thousands at the beach. Plus, how do magicians fool us with their illusions? What lies behind the mysteries of our dreams? And what new powers will be discovered by the latest scientific breakthroughs enabling doctors to plug a camera directly into the brain?