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With 2 good boxes and some aluminum foil you could build a solar oven.
Pizza Box Solar Oven
Solar Oven Made From a Pizza Box
Make s'mores by cooking them in solar ovens made from old pizza boxes
Easy DIY steps to creating a "solar oven" out of a pizza box - from Kids Activities Blog
Solar Ovens cooking smores! Brilliant!
Build Solar Oven
Pizza box solar oven: project for kids