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Where to watch "Human: The World Within"
![](https://image.tmdb.org/t/p/w1280/6nZANJagj7V4Xa3fVJQq5K3bNBO.jpg)
6. Birth
No release date yet
Unpack the science of hormones, infertility, epigenetics and more as expectant parents navigate the challenges and wonders of pregnancy and birth.
![](https://image.tmdb.org/t/p/w1280/3l4X6pAPFYU6WMngjaNv9ptnvs5.jpg)
5. Sense
No release date yet
A figure-skating duo masters jumps, a perfumer evokes memories, and a singer who is deaf learns pitch through the power and flexibility of the senses.
![](https://image.tmdb.org/t/p/w1280/lxdeGEwVCJbQUMl67fprIYKGuOb.jpg)
4. Defend
No release date yet
It's complex, invisible and always changing. Explore how our immune system fends off microscopic threats with extreme precision and speed.
![](https://image.tmdb.org/t/p/w1280/7dlMWknUwo9TbpflJletoGCoTyf.jpg)
3. Fuel
No release date yet
Home to a sophisticated ecosystem, the human gut processes the fuel our bodies need to thrive — whether we're fasting or running an ultramarathon.
![](https://image.tmdb.org/t/p/w1280/be3QM0A0Uyi9FtF2pGmQSPBzssx.jpg)
2. Pulse
No release date yet
The heart powers us through extreme physical and emotional challenges, from an ice climber's dangerous ascent to a widow’s grief and resilience.
![](https://image.tmdb.org/t/p/w1280/bHSo581XEifaLBEu0lx9RMKQ6r.jpg)
1. React
No release date yet
Through the eyes of a boxer, a first responder and a man with a bionic hand, see how the brain and its vast nervous system turn information into action.