How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- Are teeth bones?
“Teeth aren't bones.”
Reference: American Dental Association
More from this shelf
What is the hardest substance in the body?
Tooth enamel is the hardest substance in the human body.
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.