How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- Why do ears pop?
“Ears pop when the Eustachian tubes equalize air pressure.”
Reference: Cleveland Clinic
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What is the smallest bone in the body?
The smallest bone in the body is the stapes, in the middle ear.
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.