A farmer in Washington state thinks the best thing to do with a pumpkin, carved or not, is shoot it out of a cannon. John Thompson can fire a gourd as far as a mile with his homemade cannon. Hundreds ...

Big power, big risk, and an even bigger blast—this plasma cannon isn’t just for show. I built it from scratch, pushed it to the limit, and fired it off with results that shook the whole setup. Sparks ...