> At the time that I wrote this book I knew about 20 programming languages and could learn new ones in about a day to a week depending on how weird they were.

> At the time that I wrote this book I knew about 20 programming languages and could learn new ones in about a day to a week depending on how weird they were. Funny. I've been programming quite a bit too and feel comfortable in a handful of languages. Knowing what's happening in the compiler and in the hardware or vm (runtime) is a different story. Being able to understand what programs do no matter what language they're written in is also a different story. We all know 20 different languages.