This is so inspirational!
Fun to watch, but quite a few of them can't really be called new inventions. Pulsejets, for example, have been around for more than a century and people have been attaching them to all sorts of vehicles for years. Making rockets by pressurising water and air inside plastic bottles is far from new, too - I was making those 35 years ago!
Yes - some of them were yesteryear. I loved the wooden bike and the pecan picker and dropper.