I think it's just the first lecture, the tape of which was damaged somehow - https://twitter.com/preskill/status/1398371618372526080 https://twitter.com/preskil

I think it's just the first lecture, the tape of which was damaged somehow - https://twitter.com/preskill/status/1398371618372526080 https://twitter.com/preskill/status/1398371618372526080.