The CIA Scientist Who Built “UFOs”
This belongs on the periphery of the "science" thread, but it's an interesting watch about what we might call UFO technology - the potentially classified/top secret aeronautic tech (anti-gravity).
There's a lot of material I've not heard before - and enough science-y words that make you consider what the technologies are about. It focuses on the work of Townsend Brown, so if you know his work, you probably know this documentary already, but if not, you might like it.