What I really like about the books is that I often get introduced to something new from online articles, but a 300-500 page book on the topic is too much. These books are 120-180 page and each page is quite small.
There are almost 500 books in this series, and each one is written by an expert in the field with the objective of being thought-provoking and balanced. All sorts of topics are covered, including science, social science, sports, music, literature, sexuality, poetry and on and on.
I've already read the books on Brain and Robotics, and I'm currently reading Memory, Spirituality, and Anthropology. Apart from Robotics, I liked all the other ones so far.
I've also recommended the book series to 5 friends so far, and each one has said that they love it. And in any group of 10 people, I find that at least one person has been looking for something of this sort.