"Euthenics, the Science of Controlled Environments. Appealing to Better Living Conditions as the First Step to Higher Human Efficiency" is an important work by Ellen Richards, in which she explores issues related to improving the environment around us in order to improve the quality of life. The author convincingly proves that the state of the environment directly affects a person's physical and mental health, as well as his productivity. In addition, Ellen Richards calls for changes in housing, nutrition, education, and hygiene as a necessary step toward achieving higher human performance. This book is an essential resource for anyone who wants to make the world a better place to live and work."