[voiceover] Germs, disease, toxins, our bodies encounter dangers all the time, just beneath the surface, hidden. Whether you realize it or not, your body is constantly protecting itself. Every time you blink your eye, you wash away thousands of unwanted microbes. Breathe in too much unwanted pollen and you sneeze. The body knows when it's encountered something that doesn't belong. The body detects the invader, it releases its white blood cells, and it attacks.
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