This book gives a great understanding of what the greatest scientists in history altered. If you are interested in learning about past scientists like Albert Einstein, Benjamin Franklin, Louis Pasteur and etc. If you were to read should should expect a lot of reading. This book explains 126 scientists and what they accomplished so you should be reading this book for a while but as I said if you want to know about these scientists that have changed the course of history then this book you should consider reading this book.