How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- Can the brain feel pain?
“The brain itself has no pain receptors, which is why some brain surgeries can be done while the patient is awake.”
Reference: Cleveland Clinic
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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.
When to not have grapefruit
If you've had an organ transplant, it is best to avoid eating grapefruit or drinking grapefruit juice (it interferes with the anti-rejection drugs in your blood).