A few points here, which I'm just going to put into bullet points rather than stringing together because they're all mostly completely detached. - You are misu

A few points here, which I'm just going to put into bullet points rather than stringing together because they're all mostly completely detached. - You are misunderstanding their argument. They put 300-400 pounds at the bare minimum for a human flying machine + human, whereas were arguing that they max weight for flight would likely be in the ~50 pound ballpark. - Can you point to any significant misunderstandings of physics they had? I have quickly skimmed the article multiple time sand have not noticed any. - Physics does not say what is or is not possible in the world, the characteristics of the world do. Atmospheric pressure, material science, and other factors all have to work together favorably to enable flight. The exact same with spaceflight. If our world was just 50% larger at the same density/composition, it would be impossible for current spaceflight technology to work owing to the tyranny of the rocket equation. - The most fundamental point here is probably that science is not the alpha and omega. It's our best guess approximation of how the world works, but science always obeys the world - and not vice versa (though good science does make surprising predictions as a means of demonstrating it's a good approximation). So for instance relativity and quantum mechanics are still extremely accurate given all we know, yet simply do not play well together at all - meaning something is definitely wrong. It's akin to how Newtonian physics works 100% well for nearly everything, yet somehow could not explain the orbit of Mercury. For many decades people thought there was another invisible planet somewhere - heh, dark matter so to speak. Of course it turns out that that "somehow" is because Mercury was close enough to the Sun for observable relativistic factors to start kicking into play and break Newtonian mechanics. As one observes more of the world, and it's seemingly endless oddities, the science changes to keep up.