A straw is pivoted on a pin in the center and can spin on a refill. Attach a balloon on one end and inflate it from the other end of the straw. As the balloon deflates air will gust out of the straw and spin it round-and-round.
http://www.arvindguptatoys.com/toys/Spinningballoon.html This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged
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