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Wheels aren't the only things that can "roll" objects that are placed on top of it. Make non-intuitive shapes from cutouts and a compass to demonstrate this.

1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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If you have 3-foot dowels and rubber bands, you can can started on this fun and open design challenge. You can make structures big and small: make it so you can fit your parent into it!

1 cent - $1 per student Ages 8 - adult 10 to 30 minutes