In the NASA live stream yesterday, during one of the interview a engineer mentioned, that one of the harder aspects about the primary mirrors (if I remember cor

In the NASA live stream yesterday, during one of the interview a engineer mentioned, that one of the harder aspects about the primary mirrors (if I remember correctly), was figuring out how to test the equipment in the cryogenic vacuum chamber. What they mentioned they couldn't fully test, was deployment in zero gravity. So far I think NASA has done a great job, trough blog posts, videos, websites explaining and visualizing different aspect of JWST in a way that is tangible for laypeople.