My children and I use them to make solar hot dog cookers. Cut out a rectangle the less than half the size of the can but large enough to let lots of sun shine through, put clear oven bag cut to size over the hole (or clear acetate) and tape it in place. Poke a hole in the center of the lid, and in the center of the bottom. Insert a skewer. Ta-da! A hot dog solar cooker. To use it, put the skewer through the hole in the bottom of the can, poke it through a hot dog and then through the hole in the lid. Place in the bright sun for an hour or so, and you have a nice little lunch or snack, have done an educational project and not used any power, except from the sun!
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