How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- When do teeth start forming?
“Teeth begin forming before birth.”
Reference: American Dental Association
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What is the hardest substance in the body?
Tooth enamel is the hardest substance in the human body.
When does the brain finish developing?
The brain isn't fully developed until about the mid-20s, and the prefrontal cortex, which handles planning and impulse control, is one of the last parts to mature.