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Human: The World Within
Defend
Season 1
Episode 4
Look 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.
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52:30
See how the technology of the brain and nervous system shape our experience of the world.
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52:33
Explore the incredible world of human sensation and how it defines our reality.
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52:33
Journey through the factory at the center of our bodies that turns food into energy.
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52:30
See the world beneath the human heartbeat that makes our craziest feats possible.
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52:30
Learn the story of human reproduction from attraction to a baby’s first breath.