This is a joint biography of two significant scientists of the early 20th century whose lives and work and marriage are explored fully within that difficult period of rapid scientific advance, cultural hurdles, and political and social upheaval. Unlike many others, it gives full personal and scientific attention to both partners in this marriage. It provides a very informative and at times heartbreaking account of the hurdles, struggles and triumphs experienced by each, and especially by Tatiana Afanassjewa as a female student and scientist in that era.