For grades 3-8. You will need
a piece of paper, scissors, a bendy straw, and a ping pong or foil ball. Cut a
circle out of your piece of paper and cut a straight line from the outside to
the middle. Then, fold the paper in a way to make it look like a funnel. Tape
the shape and attach the small end to the short end of a bendy straw and tape
it steady. You can then put a ball in your funnel and blow through the long end
with steady air flow to make your ball float. More details and pictures in the
link.
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