How on Earth is Lex (an obviously intelligent and educated individual) not familiar with the concept of rotating a space habit to create “gravity” ?? When Ariel mentions that to create gravity you simply have to spin the habit, Lex replies with incredulity. How!? He’s never learned about centrifugal force? He’s never seen sci-fi films? I’m no genius, and I became familiar with this concept as a small child. It’s ubiquitous in sci-fi and space exploration and is not a new idea by any means. It’s like seeing him not know that you can drink from a glass instead of a bottle. How does he not know this already!?