Building a Model 4-Stroke Internal Combustion Engine (your car explodes gas 50x a second, how cool is that?!)

Garage sales are great for finding random, interesting things to do with the kids, usually for dirt cheap. Unless you run into one of those garage sales where everything’s only 5% off the original retail price… Folks, your garage sale is one step before the dumpster. Don’t try to fund next summer’s vacation. Make a few bucks, clear out the basement and enjoy a night at the movies. Splurge on a large popcorn and 80 oz drink. Thank you, that is all.* Last summer, I found this “Smithsonian Motor-Works” set for $5, which I figured was a »