Another powerful factor in the development of belief in the supernatural is that of man's attempt to explain natural happenings. Why do things happen? Why does the sun rise and set, why does rain fall, thunder crash, rivers flow? Note the way in which a child answers similar questions, and one is on the track of the primitive intelligence. If man's own movements are caused by a 'soul' or double, then other things must also move because they possess a 'soul.' If an answer is to be found at all, it is only along these lines that the primitive mind is able to find it. And, once the answer is given, there are a thousand and one things occurring that lend it apparent support. Resemblances in nature, coincidences, echoes, shadows, etc., all give their support to this primitive hypothesis--the only one possible in the circumstances, and the one still endorsed by the majority of the world's population. Particularly strong endorsement of this belief is supplied by disease and abnormal nervous states. Instances to illustrate this are innumerable, but from the numerous cases cited by Spencer I select the following: Among the Amazulus convulsions are believed to be caused by ancestral spirits. With Asiatic races epileptics are regarded as possessed by demons. With the Kirghiz the involuntary muscular movements of a woman in childbirth are believed to be caused by a spirit taking possession of the body. The Samoans attribute all madness to possession. The Congo people have the same notion of epilepsy. The East Africans believe that falling sickness is due to spirits.[17] In Rajputana, says Mr. W. Crooke, disease is generally attributed to Khor or the agency of offended spirits. The Mahadeo Kolis of Ahmadnagar believe that every malady or disease that seizes man, woman, or child, or cattle, is caused either by evil spirits or by an angry god. The Bijapur Veddas have a yearly feast to their ancestors to prevent the dead bringing sickness into the house.[18] "A Catholic missionary," says Professor Frazer, "observes that in New Guinea the _nepir_, or sorcerer, is everywhere.... Nothing happens without the sorcerer's intervention; wars, marriage, death, expeditions, fishing, hunting, always and everywhere the sorcerer."[19]