This jet engine is the size of a soda can, and it actually works. Micro turbines used in drones and experimental aircraft are real jet engines shrunk down to just a few inches. They use the same principles: intake, compression, combustion, and exhaust, but at a tiny scale. Some hobbyists have built jet-powered skateboards or RC planes that hit 300 kilometers an hour. These engines spin at over 100,000 RPM and burn jet fuel like their big brothers. It's like holding a tornado in your hand. And it