Facial nerve paralysis. Facial nerve paralysis most commonly causes a unilateral, but sometimes bilateral, paralysis of the muscles responsible for facial expression. Patients often present unable to move the lip or blink and with a droopy ear and severe ptyalism.
The Fourth World is an extension of the Three-World Model, used variably to refer to. Sub-populations socially excluded from global society; Hunter-gatherer, nomadic, pastoral, and some subsistence farming peoples living beyond the modern industrial norm.
The Fourth Crusade and the crusading movement generally thus resulted, ultimately, in the victory of Islam, a result which was of course the exact opposite of its original intention. The Fourth Crusade is depicted in Poul Anderson 's novel There Will Be Time from the point of view of a 20th Century Time traveler who saves the life of a Byzantine girl during the carnage and falls in love with her.