This book is great, it kept me entertained for hours. Being curious and not having much science training, this book blew the dust of the stuff I learned (or was supposed to learn) in school. It makes you go "A-ha, of course!" a lot. The author is witty and while he probably takes his job seriously he manages keep the book entertaining throughout. The book explains a lot of stuff that you've probably never thought about and/or take for granted, like, why is oil slippery and water is not even if both are liquids. Sure, this may not be interesting to a chemist but to most other people it is. The explanations are usually short, 1 - 2 pages, which makes it perfect for dipping into on the bus or at the doctor's waiting room (or the bathroom). There's even a few things you can try out yourself at home. There's nothing as beautiful as your own private sunset in a glass of water and milk. "What Einstein Didn't Know" is also a great help to me as a dad. It was great to be able to explain what was happening when my 6-year old son commented on the noise the ice cubes made when I put them in his juice (of course, that triggered a lot of other questions which reminded me to buy the sequel). This is one of those that I'll read again some day.