I enjoyed this book and was disappointed. It does provide a brief overview to 50 interesting topics, but it provides too little information. It does little more than just whet the appetite, not even enough to figure out if a more in-depth study would be interesting to you.
I did like the layout. Each topic is two pages. There is a block of related information, a timeline of 4-5 major events related to the topic, and the text has about 3 or 4 tipics in easy-to-see section.
The quality of information is good when you have no, or very little, prior knowedge on the topic. But it is light reading and good as a reminder or refresher.