How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- How much mucus does the nose make?
“The nose and sinuses produce about a quart of mucus a day.”
Reference: Cleveland Clinic
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How many scents can the human nose detect?
A 2014 study estimated that humans can tell apart about a trillion scents, though other scientists dispute the number.
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.