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if you're looking for more technical ones the two interviews he did with Crhis Lattner on compilers are great. Francois Chollet and Schmidhuber and other ML related interviews were good also.

But he does seem to be doing less and less of the scientific interviews which is a little bit of a shame given the unique access he seems to have.

They sometimes go deep, but that is more at the discretion of the interviewee than Lex. Lex is usually asking questions about topics he has only tangencial knowledge in but is the expertise of the interviewee.

The Chris Lattner episodes are great, and James Gosling had some fun stories in there, and Kernighan had a good interview as well.

Lex and Joscha Bach episodes were fascinating to me as well.

And he always asks them the question "What is life?"