Small when there is so much to read, it's worth it. I bought it for my daughters tell the news it contains. They have not hooked, not because the news is bad, or they would not imaginative. But because they involve concepts that my little girls do not yet understand. Good news though: in the book's introduction, there is a fascinating debate between Villani, Klein, and Leglu Lahoucq (I admit that I got more interested in the debate). There is a passage on Stephen Klein abnormal observations (anomalies). Another, unusual, where Cédric Villani cites joke Cercignani Carlo explains the fall of Newton's apple from the theory of natural selection Darwin.