Nice to see a book on mathematics released through mainstream publishing even though it's a glossy and feels more like a coffee table book. A lot of the book can unfortunately only be of interest to readers with a decent understanding of history and math but then also leaves a very unsatisfactory feeling, glossing over too many explanations, leaving out details that I, for one, would be interested in, having forgotten a lot of the maths I learned at university.
The book's tendency to list problems without explicitly stating either solution or explanation sometimes even is frustrating and as a result, the book's intended audience remains unclear: it's probably too obscure for the average layman and not detailed enough for the inquiring mind.
Interesting bits:
+ The Egyptians were the first to divide the day into 24 units. However, originally, these bits were not of equal length.
+ In answer to Ptolemy's (Alexander's general who founded the dynasty to which Cleopatra was the last heir) request to Euclid for a shortcut to learning geometry, Euclid answered "There is no royal road to geometry".
+ In Islam, the afternoon prayer has to take place when the length of an object's shadow cast at noon has increased by an amount equal to the height of the object itself.