How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- How long is the small intestine?
“The small intestine is about 20 feet long.”
Reference: Cleveland Clinic
More from this shelf
How many bacteria live in the gut?
The gut is home to trillions of bacteria, known as the gut microbiome.
What is an "otter tail"?
The Labrador Retriever has a thick, rounded, tapering "otter tail" that works like a rudder, helping the dog steer while it swims.