I read the book from the library. Great read though can be a bit technical with chemistry. These chemical engineers were really courageous and inquisitive. The

I read the book from the library. Great read though can be a bit technical with chemistry. These chemical engineers were really courageous and inquisitive. They have tried so many different combinations to find the right propellant. I would laugh thinking the book is worth more than my iPhone. If I stole the book, I doubt I would find a buyer for the price you see on Amazon but for sure I would be asked to reimburse the library for that price!