Notes

Materials: Two large, shallow cardboard boxes—the inner box should be at least 18 x 22 inches, preferably just a little bit taller than your pots; the outer box should be a little larger in all dimensions so there is at least 1–2 inches of space between the two boxes when they are nested. You’ll also need corrugated cardboard at least 6 inches longer and wider than the outer box to make the lid; window glass (or Plexiglas) at least 20 x 24 inches and longer and wider than the inner box by 2 to 3 inches; a thin, black metal sheet, sized equal to or slightly smaller than the inner box; 50 feet of aluminum foil; dry plant fibers such as leaves or straw or at least 50 sheets of newspaper, quartered and crumbled; glue silicone caulk; and rigid wire (hanger wire, for instance). - See more at: http://www.chelseagreen.com/blogs/weekend-project-how-to-build-your-own-cheap-simple-solar-oven/#sthash.vbPc6IzV.dpuf

-solar heater project 5th grade