Boats From Walnut Shells
Materials
an unbroken half of a walnut shell
clay
a piece of paper
blunt scissors
a pencil
toothpicks

Carefully cut a walnut shell in half.
Put a small wad of clay inside of it.
Draw a sail about the size of a postage stamp and cut it out. Put a toothpick mast in and out through the sail. See Picture. Stick the bottom end of the mast in the clay.
Your boat is ready to sail. You can make several boats and have races.