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Boston Latin School senior Taran Wise explains how students grow lettuce in the middle of winter at the school's Freight Farm. (Full story here: http://wbur.fm/1Hb7tQu) On the lawn behind Boston Latin School is the recycled metal shipping container that holds the school's hydroponic farm. Inside its insulated walls, the low-energy farm grows fresh produce year-round. The freight farm — named after the shipping container — is operated by students who dedicate time to the farm during study halls and after school. “What the freight farm is, is a hydroponic farm which uses no soil,” says Taran Wise, a senior. “So it circulates water through the farm, mixed with nutrients.” Wise explains how the students grow lettuce from seed to green leaves for your salad. See more stories from WBUR's Learning Lab here: http://wbur.fm/1HCU6t4