This is a neat project to do to teach the girls how to use a jackknife.
From The Happy Scientist, Robert Krampf

Whistle Stick

This week's experiment is a trick that my Grandfather taught me when I was very young. He called it a "whistle stick", and making one brought back delightful memories from my childhood. It is a marvelous toy, made in a minute from a popsicle stick, but it is also an interesting science puzzle to solve.


You can find this experiment, with photos and a video to help, at:
http://thehappyscientist.com/science-experiment/whistle-stick

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