Jack Kelly. Gunpowder: Alchemy, Bombards, and Pyrotechnics : The History of the Explosive That Changed the World. New York, Basic Books, 2004.

When Chinese alchemists fashioned the first manmade explosion sometime during the tenth century, no one could have foreseen its full revolutionary potential. Invented to frighten evil spirits rather than fuel guns or bombs—neither of which had been thought of yet—their simple mixture of saltpeter, sulfur, and charcoal went on to make the modern world possible. As word of its explosive properties spread from Asia to Europe, from pyrotechnics to battleships, it paved the way for Western exploration, hastened the end of feudalism and the rise of the nation state, and greased the wheels of the Industrial Revolution.