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People who have observational capacity are able to witness a situation for themselves. For example, a person who was in Nepal to analyze the effects of the 2015 earthquake or was in Syria and witnessed the civil war would have more credibility than those who watched these events unfold on television. Sources with training and experience also make more credible observers. Thus, a person with expertise in child development would learn more by watching children respond to a violent video game than would a member of the general public.