Isaac Arthur... why am I only just finding this channel?

It's lengthy videos on cool topics, like maybe a dozen takes on the Fermi Paradox and various proposed explanations thereof.
Topics tend to be fringe science / border on science fiction, but he takes them seriously and tries to explain why they aren't science fact... yet.
e.g. space elevators, and their various cousins, Dyson spheres and swarms, and how to drive a star around the universe

https://www.youtube.com/channel/UCZF...6grh54g/videos