📒 Ellen Karolina Sofia Key (1849-1926) was a Swedish difference feminist writer on many subjects in the fields of family life, ethics and education, and was an important figure in the Modern Breakthrough movement. She was an early advocate of a child-centred approach to education and parenting and was also a suffragist. She is best known for this work, first published in the original Swedish in 1900 and in English translation in 1909.