You'd be surprised how ridiculously simple and interesting this book is. It starts off assuming you know nothing. It then proceeds to explain what the heart is, how it works, what an EKG is, how to read EKG's and what they mean.

Simple yet well balanced graphics inform with ease. There are also many real world EKG's displayed, from normal hearts to abnormal conditions. You do not need any previous science education to understand this book, yet it's so helpful it's used by medical students and residents. Check a look at the sample page picture here to see how simple it is.

Obviously this is a kind of narrow subject but I (not a doctor) found it very interesting. Anyone in the health sciences or just curious about EKG's and the heart will learn a lot from this enjoyable book.

Read your own stress test! (Actually, leave it to the professionals, but you could with this book).

Mad Biologist use:

You'll find this skill necessary when animating your Frankensteins.