Vaccines prevent between 2.5 and 4 million deaths every year.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Everyone has one nostril that is larger than the other.
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The human body produces and destroys 15 million blood cells every second.
negative feedback loop
Degree of palpation
Burn Degree By Tissue Layer
Negative feedback control of the female reproductive hormones