I'm reading
How To by Randall Munroe.
Munroe, the creator of
xkcd.com, is a true nerd at heart. This book takes situations (sometimes insane ones--one chapter is titled, "How To Make a Lava Moat"), and applies scientific investigation to them to explain how you
could accomplish that task. Then, pushes the envelope in different ways.
It's a pretty fun read, for science geeks who also enjoy a bit of craziness.