This was an very interesting and readable book. The author covers the entire history of gunpowder. While much of the content is naturally taken up by the interplay of the development of gunpowder and artillery/firearms, he also touches on civilian uses. I like that he clearly explains the incremental enhancements in formulation and manufacture over time with clear exposition of the value to end use applications at each stage. After this one, I will definitely look for more books by Jack Kelly.