Mendota High School

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In this March 10, 2014 photo, Kyle Ladenburger, left, shows Mendota High School sophomore Damian Hebert how to push lettuce seedlings into the hydroponic system for maximum nutrient intake at the school in Mendota, Ill. The hydroponic system was installed in the school’s greenhouse earlier this year and will produce 180 heads of lettuce in about 60 days. The crop will then be served in the school cafeteria. (AP Photo/NewsTribune, Tamara Abbey)