Answer:
The difference between the belief structure among Muslims has to do with descent. Sunni Muslims are the most dominant group. They believe that descent comes through Abu Bakr, Muhammad's friend and closest advisor. Shiites believe that descent must come through Muhammad's family, preferably his cousin and son-in-law.
Explanation: Beliefs about descent divide Muslims into different expressions of their faith as well as how the faith can manifest and the role of religious leaders.
They were too large and expensive - typically a computer would fill a room and would have to have its own power supply.
