My son took an engine off of an old lawn mower that doesn’t work any more. They spent two hours Monday night racing it down our hill and pulling it up the hill with the lawn mower that works with a chain.
Leave it to kids to dream up learning activities for themselves. We they do it themselves they do not realize that they are learning.
I cannot figure out how to type under the bottom pictures. Hope you enjoy and let me know what kinds of things your kids like to build.