A collection of biographical essays concerning 23 women physicists and chemists in the field of radioactivity in the first part of the 20th century. The book is noteworthy for including nearly forgotten women scientists who worked at a time when established science did its best to discriminate against them. Physicist and Nobel Laureate (1935) James Chadwick, noting that radioactivity counting in Vienna was done exclusively by women, said women "can concentrate more intensely than men, having little on their minds anyway."