Japan has built a $2,500 cardboard drone. It actually flies fast while avoiding radar! At first, the military thought it was a joke. A plane made of… cardboard? Yet, this drone can travel nearly 80 km at over 100 km/h. And the craziest thing is that its material becomes an advantage. Cardboard reflects radar waves less than some conventional materials. As a result, it's harder to detect in the sky. Japan can even transport hundreds of them in a single container and assemble them in minutes. While some countries are building drones costing millions, they're focusing on machines that are practically disposable. Perhaps this is the new technological warfare: Simple, ultra-fast weapons… produced like Amazon packages. Subscribe to discover incredible human advancements in five minutes a day.