The knowledge of the realm of death makes it possible for the shaman to move freely back and forth and mediate these journeys for other people.
According to materialistic science any memory requires a material substrate...
When we are dealing with death we are constantly being dragged down by the...
It would appear that we have reached the limits of what it is possible to achieve with computer technology although one should be careful with such statements as they tend to sound pretty silly in 5 years.