Why do you unravel a clue?
A "clue" originally meant a ball of thread. This is why one is said to "unravel" the clues of a mystery.
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How long have people been using maps?
The oldest known map is carved on a clay tablet that dates to about 2300 B.C., which now resides in the Fogg Art Museum in Cambridge, Massachusetts. Excavated at Nuzi in northern Iraq during the early 1920s, the clay map portrays the river Euphrates flowing through northern Mesopotamia.
http://www.arcamax.com/trivia/s-745210-667107
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