Meet the female scientists who served as both developers of the atomic bomband the first line of criticism against itin this nonfiction narrative in the tradition of Bomb and Code Girls.   They were leaning over the edge of the unknown and afraid of what they would discover there   Recruited from labs and universities from across the United States, and even from countries abroad, a little-known group of female scientists were invited into the secret sites of the Manhattan Project. During World War II these women worked onand in some cases initiatedthe development of the atomic bomb, taking starring roles in one of historys most infamous scientific feats. But despite their involvement, critical to the projects success, many of them werent made fully aware of the consequences.   This book explores not just the steps toward the creation of a successful nuclear bomb, but also the moral implications of such an inventionand how female scientists of the time grappled with the f