Einstein's theory
Concept
The theory that prohibits faster-than-light travel and sets boundaries with spacetime, which is relevant to discussions of locality.
Mentioned in 2 videos
Videos Mentioning Einstein's theory

Science & Survival: A Conversation with Martin Rees (Episode #323)
Sam Harris
Mentioned in contrast to Newton's laws, providing a deeper understanding and wider applicability, and expected to be incorporated into a future unifying theory.

Why is quantum mechanics non-local? (I wish someone had told me this 20 years ago.)
Sabine Hossenfelder
The theory that prohibits faster-than-light travel and sets boundaries with spacetime, which is relevant to discussions of locality.