Dividing by zero is 'undefined', ½×base×height gives us the area of a triangle, (a+b)² is equal to a²+2ab+b²- the list can go on and on. We cram so many things in our brain by rote learning without thinking much. But do we really know the origin of the ideas? Do we know how the ideas developed or what they actually try to tell us? Can we 'feel' them? This book is not a pile of knowledge; it aims for fun, the fun of thinking. The author thinks that mathematics is the most interesting subject in the world. A lot of people fear math because the fun-elements are not presented to them. How peculiar was the lives of mathematicians? Who actually discovered the theorem of Pythagoras? How did the idea of the theorem originate? What was the problem of 'three girls'? How can we calculate the number of hairs on our heads? If Ananta Jalil make a film about mathematics, what would be his dialogue? The book is based on such amusing but profound ideas!