How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- How often does skin renew itself?
“The outer layer of skin renews itself about once a month in young adults.”
Reference: American Academy of Dermatology
More from this shelf
What is the largest organ in the body?
Skin is the body's largest organ, covering about 20 square feet in adults.
What mold produces penicillin?
Penicillin comes from Penicillium mold, the same group of molds you might find growing on old bread or fruit.