Science: Gold at Hell Gate

At anchor in the scummy waters of Manhattan's East River, off 130th Street, lolled the 50-ft. white yacht Josephine with a red work flag flying at her masthead. For weeks & weeks Josephine had gone undisturbed about her business until one day last month the big seagoing tug Terminal bustled up, dropped anchor, went to work. From the Josephine came indignant cries of "poacher!" The men of Terminal retorted that nobody owned the river. A Coast Guard cutter appeared, ordered the tug to keep clear of the cables on the bottom. By last...

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