This book is a collection of small essays written based on the various scientific discoveries and reports. Every Essay has a reference section which highlights the reports/ books on which the essay refers to. This is a surely a USP of this book for me. It gives you a point of reference then and there itself.
About Essays and its Topics, I really enjoyed reading each one of the Essay, it surely opened new avenues and lined up many questions in mind. There are so many things in nature which are unanswered still and we have no clue about them. A great number of Essays were dedicated to Human mind and its enigmas. Those Essay are pretty interesting ones. All in all I would rate this book 4/5, Also this book is written in 1970's and still most of the Questions posed in the book does not have answer still in this 21st century also. That explains the vastness of Questions posed in the Book.