Use an old tire to create a small backyard pond. My kids, 3 sons, have been helping with yard work and planting. They keep asking for a pond. I think this is a great DIY project to do outside with them. Looks simple.
rocket stove design that is better suited for indoor use. It does take some getting use to in the sense that if one doesn't stack the wood in properly it smokes back into the house. This also lends to thermal mass heating.