How many neurons are in the human brain?
The human brain contains about 86 billion neurons.
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- How much of taste is smell?
“Much of what people think of as taste is actually smell.”
Reference: Scientific American
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An interesting fact about chameleon tongues
A chameleon's tongue is twice the length of its body.
How many scents can the human nose detect?
A 2014 study estimated that humans can tell apart about a trillion scents, though other scientists dispute the number.