"Hardcore Inventing" written by Robert Yonover, the inventor of RescueStreamer now deployed in all navies and air forces of the world, contains extremely inspiring ideas for entrepreneurial innovators.
After Peter Drucker's "Innovation and Entrepreneurship," we all know entrepreneurial innovation must be "simple".
According to the authors, it should be ape-level, caveman-level simple.
In their primitive conditions, our primitive ancestors innovated "quickly" as their survival depended on it. They used only "materials at hand" and scavenge these resources by "carefully observ[ing] [their] surroundings".