I believe the answer is: Iconic memory
Iconic memory refers to the type of memory that taken from one of our senses which last on a very short period of time before it fades.
Iconic memory happens because of the mix-up between short-term memory and long-term memory and would explain weird psychological occurrences such as De javu.
This historian would be using "research skills" at this stage of the process, since he or she has yet to determine all the facts, and therefore is unable to yet form a thesis.
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For the genocide in India
Berger describes sociologists as concerned with: a. monumental moments in people’s lives
Berger describes sociologists as concerned with: b. common everyday life events
Answer: both a and b