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5:23
Facebook
TED-Ed
1.5M views · 13K reactions | Without your immune system, you’d be exposed to billions of bacteria, viruses, and toxins that could make something as minor as a paper cut or a
TED-Ed. . Without your immune system, you’d be exposed to billions of bacteria, viruses, and toxins that could make something as minor as a paper cut or a seasonal cold fatal. Here's how it works:
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