What is your all-time favorite science related book?

[Mari]

Picking an all-time favorite is hard, so top 2 or 3 is great too!

My two favorites are:
The Lorax
Timeless classic, great for all ages.
I don't usually say this about book-based movies, but I love the movie too!

A Short History of Nearly Everything
I read this last summer, and I know I'll need to reread it every few years. The book itself was pretty complete, very engaging, and I learned a lot about science that I did not otherwise know.

What are yours?