"Finally, he pointed out that there have been no significant advances in computer science for several decades. He's got some background in biology, and for years he tried to keep up with the field. Every couple of months he'd go over the new developments in biology, but several years ago things were moving way too fast for him to keep up. Not so in computer science. We're still mostly catching up with Lisp.

Speaking of Lisp, he named it as the single most important idea in computer science." (grace)

It takes 5 years for C# to come up with Expression Trees. LISP had those features 40 years ago.