How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- Do koalas have fingerprints?
“Koalas have fingerprints that look very similar to human ones.”
Reference: Smithsonian Magazine
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What is the largest organ in the body?
Skin is the body's largest organ, covering about 20 square feet in adults.
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.