How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- How many air sacs are in the lungs?
“The lungs contain about 480 million tiny air sacs called alveoli.”
Reference: Cleveland Clinic
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Why is the left lung smaller?
The left lung is smaller than the right to make room for the heart.
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.