[voice over] Your body contains approximately 35 trillion cells, and every one of them is constantly being pulled down to earth by gravity. When you're lying down, gravitational forces are spread between the thorax, abdomen, and legs. Stand up too fast, and blood rushes downward, away from the brain. It causes dizziness or even fainting. It's a minor miracle our cells get anything done at all. Because the human body has to perform even the simplest of tasks, either under unimaginable pressure.
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