Defend
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.
Previews + Extras
Episode 4 Preview | Defend
S1 E4 - 30s
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.
The Immune System
S1 E4 - 2m 6s
An introduction into the amazing functions of the human body's immune system.
Similar Shows
Living Wild: Plant-spiration with Hilton Carter
Science and Nature
Physics Girl
Science and Nature
EARTH A New Wild
Science and Nature
Potomac by Air: Our Nation's River
Science and Nature
First Contact: An Alien Encounter
Science and Nature
Extinction: The Facts
Science and Nature
Project Asteroid: Mapping Bennu
Science and Nature
The Brain Revolution
Science and Nature
Butterfly Town, USA
Science and Nature
Fascinating Fails
Science and Nature
WETA Passport
Stream tens of thousands of hours of your PBS and local favorites with WETA Passport whenever and wherever you want. Catch up on a single episode or binge-watch full seasons before they air on TV.