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The human immune system is the most complex biological system we know, after the human brain, and yet, most of us never learn how it works.  Or what it is.  Your immune System consists of hundreds of tiny and two large organs, it has its own transport network spread throughout your body.  Every day it makes hundreds of billions of fresh cells.  This video shows what happens when your body is invaded and your first lines of defenses are engaged in a fight for life and death.  You can preorder the book "Immune: A Journey into the Mysterious System That Keeps You Alive" here: amzn.to/3ABhys5

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