Prejudice arises from the nature of people to judge and have their own opinions on a subject. Sometimes historians, and people in general, face conformation bias, in which they are more inclined to focus on one set of events and ignore others. For example, I once went to a football game where my favorite team was playing and they won the game. When my mother asked me how the match went, I told her how my team won. I can choose to ignore the other team's loss or the details of their play. Even if I don't consciously decide to be subjective in my view of the game, my brain will naturally remember certain memories with a higher degree clarity or could obstruct certain events. All of these factors would lead me to favor one team, and because the question led me to favor one side, it is no longer neutral. However, getting different accounts of the same event from people with diverse opinions can reduce bias. Additionally, technology, primarily phones, can be used to book specific events by recording them for review.