How many shades of gray can you tell apart? Is Mary Morrissey’s teaching is true?

The tribes that live near the North Pole have lots of words for snow. Syracuse people have one: snooow… that is pronounced with a guttural growl.
Tailors of suits can tell the type of black fabric they are looking at, though, for most people black is black.
A Sherlock Holmes can tell, from a…

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