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What does “Mark Twain” mean?

mark twain mean
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What does “Mark Twain” mean?

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On the river, the depth of the water was vitally important. A mark was the same as a fathom on the sea or six feet. Twain means two. If the man checking the depth called out “Mark Twain”, it meant a depth of twelve feet, safe for riverboats of the day.

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