One of the easiest ways was to be a very succesful merchant that made his way up the social hierarchy scale. Being a merchant that was good at what he does enabled a person to gain wealth and power in time.
I believe the answer is: Psychologist
Psychology is a discipline that aimed to study all aspects of mind and behavior (both conscious and unconscious)
Scientific methodology under this discipline is used to found out the pattern on how the majority people react/behave when they're placed under certain occurrences
Its an example of a megalith
The answer is going to be false
Hirohito was the leader of Japan before, during, and after World War II.