According to this tweet [1] there are also audio tapes available, I haven't been able to get them (yet). I did send a mail to [email protected] if they would consider to put a copy on the site.
I have never seen so many (mainly) positive comments in so short a time on a youtube channel. Many thanks to Grant Sanderson aka 3Blue1Brown (and also Leibniz and Newton). Lets hope probability and multivariable calculus are next.
[1] https://twitter.com/aip_history/status/1465408218507759627