Insan Thalk al-Majhoulالإنسان ذلك المجهول

Translated to Arabic, 'L'Homme, cet inconnu' (Man, The Unknown), written in 1935 by Alexis Carrel (1873–1944), a French biologist. The book was a best-seller at the time, and discusses implementing eugenics and selective euthanasia.

The book discussed "the nature of society in light of discoveries in biology, physics, and medicine". It contained his own social prescriptions, advocating, in part, that mankind could better itself by following the guidance of an elite group of intellectuals, and by implementing a regime of enforced eugenics. Carrel claimed the existence of a "hereditary biological aristocracy" and argued that "deviant" human types should be suppressed using techniques similar to those later employed by the Nazis.