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On average, the stomach produces 2 L of hydrochloric acid per day.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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