How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- Where was the first bristle toothbrush made?
“The first bristle toothbrush was made in China in 1498.”
Reference: Library of Congress
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What is the hardest substance in the body?
Tooth enamel is the hardest substance in the human body.
Amazing fact about the invention of the lighter
The cigarette lighter was invented before the match.