Seventh graders worked on an invigorating solar oven project for one to two weeks, using black boxes, insulators, and tin foil flaps to harness the sun's energy. Seventh graders worked on an invigorating solar oven project for one to two weeks, using black boxes, insulators, and tin foil flaps to harness the sun's energy—which they achieved, reaching temperatures in the 100s, enabling them to cook s'mores.