There’s a lot about the universe that is frankly, quite puzzling. But what if a puzzle is just what you needed to better understand the fundamental laws of the cosmos?
That’s exactly the goal of Puzzles to Unravel the Universe, by Harvard Physics Professor Cumrun Vafa, now available on Kindle and Amazon. The book features endorsements by physicist Brian Greene, author of The Elegant Universe and theoretical physicist Edward Witten.
As a child, Vafa was fascinated by puzzles and even incorporated them into his physics course for freshmen students at Harvard where he has taught theoretical physics since 1985. 
“Puzzles can unravel mysteries of the universe and illustrate the simplicity of physical laws and the elegance of mathematics,” said Vafa. “Mathematical puzzles are not only great fun to work on, but deeply satisfying because they capture some deeper meaning about physical reality, beyond just a puzzle.”
For example, to illustrate how symmetries can spontaneously break, an important concept in modern physics, which is the fundamental reason why particles have mass, the author poses this problem:
You have four cities on four corners of a square; What is the shortest highway system connecting all four cities?
‍Solution? It turns out that it is not the obvious answer.  You’ll have to get the book to figure this one out!