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Quacking Ducks

What you need:

Paper cup

Piece of string

Tooth pick

Small piece of foam

What you do:

• Make a small hole in the base of the cup
• Thread the string through the hole
• Tie the string securely around the toothpick so that is will not pull through the hole.
• Tie a small piece of foam to the other end of the string.
• Moisten the foam.
• Hold the foam around the string and jerk up and down to create your duck quacks!

How do you alter the pitch of the sound?