How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- Are ears self-cleaning?
“Ears are self-cleaning.”
Reference: American Academy of Otolaryngology
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What is the smallest bone in the body?
The smallest bone in the body is the stapes, in the middle ear.
Did Romans use urine for laundry?
Romans used urine to clean clothes, and Emperor Vespasian taxed its collection.