Human: The World Within - Season 1

What's behind a pulse? This episode dives into the world of an ice climber, a bus driver, a woman in labor, and a senior dance club to show how the human heart and the circulatory system power our physical and emotional lives, and create the pulsing rhythm of our world.

Running through the middle of our bodies, the human gut processes the fuel our bodies need to keep going. It's also home to an entire ecosystem whose power we're just beginning to uncover. Through the worlds of a religious faster, an ultra-marathon runner, a young girl beating allergies, and a farmer we go deep into this world within.

Every minute of every day, our bodies are fending off microscopic threats with extreme precision and speed. This episode looks at a nature survivalist, rancher twins, a doctor who survived Ebola, and the recipient of a cutting-edge cancer therapy to uncover the wildly advanced biology that keeps us alive against all odds.

How do the five senses really work? In fact, there are many more than five, and they all work together to create our own version of reality. We dive into the stories of a pairs figure skating team, a perfumer, a cave explorer, and a musician to decipher how different ways of sensing the world all create their own vivid, and unique, picture.