tPCC: What I'm reading, what I learned

I'm sure you're as voracious a reader as I am, and even as I'm typing I'm learning over a book to reach the keyboard.

This will be a simple, naked, postcard swap: Tell your partner what book you are reading, and something you learned from it. It doesn't matter if the book is new to you, or a re-read. It does matter, of course, that the book is within the scope of this group. ;-)