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See how milk is made at “The Farm,” a Museum of Science and Industry exhibit containing a spanking new John Deere tractor. It opens with a harvest festival–hay rides, pumpkin carving, square dancing and such–on the museum lawn, 57th Street and Lake Shore Drive, at 9:30 a.m. Saturday. $7 ($6 for seniors, $3.50 for children). 773-684-1414.

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