How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- How many bacteria live in the gut?
“The gut is home to trillions of bacteria, known as the gut microbiome.”
Reference: National Institutes of Health (NIH)
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How long is the small intestine?
The small intestine is about 20 feet long.
How much energy does the brain use?
The brain makes up only about 2% of body weight but uses about 20% of the body's energy.