Fold back the square flap. Cut a piece of foil to completely cover the flap. Tape it to the part of the flap that faces downward into the box, shiny side out. Make sure you press all the wrinkles out.
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No need for the freezer, you'll learn about freezing and melting in this activity.
See how worms keep your garden healthy.
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Get an up-close and near “real-time” view of our planet Earth.