In the most literal sense of the word a shaman is someone who has been born within a tribe and trained by that tribe as a medicine man or woman. Their purpose, depending on the culture, is to heal the four bodies: the spiritual, the emotional, the physical and the mental. Shamanism can be found in all corners of the earth, from South America to Mongolia, Congo and Scandinavia. According to Durek, spirit shamanism, in which shamans can receive messages from spirits and energy forces, dates back to the age of the supercontinent Pangaea. There are even tribes in Colombia in which shamans can only be born to parents who are also both shamans. When they are born, they are placed in a dark cave for 18 years so as to fine tune their powers of intuition.