HOW TO – Make a putt putt (pop pop) steam boat

Here’s how to make a fun boat powered by steam “…it wasn’t until I was an adult that I saw my first putt putt steam boat, chugging away in an outdoor market in Bangladesh– in Southern Asia– one of the poorest countries in the world. Made mostly from a recycled milk tin, it sounded like a tugboat and it really moved–all efficiently powered by a little vegetable oil lamp. How could such a cool thing have existed without my knowing about it?” Thanks Jos! Link.