Uploaded May 2017 | Updated September 2026, 2 weeks ago

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Originally called Putt Putt Steamboats in the 1920s, these reproduction toys can be used to teach many scientific principles. Using a small flame from a candle or a few drops of cooking oil, the 10 cm long boats will chug along for hours. Available at teachersource.com/product/putt-putt-steam-boat/energy-thermodynamics