I'm sure you've all been asked that question by people that just don't get it. The usual answers I give to the question is "Collect dust" or "Help increase global warming". Anyways, come here and post pictures/videos of your engine if it actually does something. Show off your electrical power stations. Show off your water pumps. Show off anything driven by the engine. It doesn't matter if you've shown it before. Let's just see in one thread how many different "uses" there are for miniature engines!! Thanks, ...Ved.