How much do you really know about the Gowanus Canal? If you're wavering somewhere around "that toxic waterway segregating Park Slope and Carroll Garden" or "Brooklyn has a canal?" you may want to shell out $9 to learn more about the infamous body of water. Gowanus expert Joseph Alexiou (he's penning a book about the canal) is teaching the class on July 18. [Brooklyn Brainery]
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