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Plastic bottles are aplenty today. With three plastic bottles, a stiff straw and two flexi-tubes you can easily make the famous Heron's Fountain. Water from the top (cut) bottle enters the bottom bottle. Air from the bottom bottle enters the middle bottle (filled with water) and pushes water to the top (cut) bottle. The Fountain continues until the middle bottle gets depleted of all its water. arvindguptatoys.com/toys/Threebottlefountain.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 population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA's Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit www.tatatrusts.org