What are your most favorite conference talks/seminars available online?

Hi, I have seen many posts discussing books here on HN, and I am grateful for those posts.

The books that I learned about from HN really added value to my life. Thanks for those posts.

Let me ask you, what are your all time most favorite talks/seminars/long interviews available online?

They might be related to tech, they might not be, as well.

Here are some of mine:

- Alan Kay: The Computer Revolution Hasn't Happened Yet OOPSLA 97 Keynote (VPRI 0719) (https://youtu.be/aYT2se94eU0)

- David Silver: AlphaGo, AlphaZero, and Deep Reinforcement Learning | Lex Fridman Podcast #86 (https://youtu.be/uPUEq8d73JI)

- Functional Programming in 40 Minutes • Russ Olsen • GOTO 2018 (https://youtu.be/0if71HOyVjY)