@Morphy... It’s not that it’s that common. It’s just that I knew what terminology to search for because I’ve looked before. I participated in a research project several years ago for the FAA where we were trying to understand what the real danger was from falling drones. Congress told the FAA to come up with rules to regulate hobby drones, but nobody knew what the actual risks were to flying one over a crowded area, so we did a bunch of drop tests onto various targets representing a human head and tried to put some numbers behind the question so they could try to come up with reasonable safety rules. Did my work make a difference? I don’t know, but I learned what chunky penetration was