Events witnessed by many people generally cannot become scoops, (e.g., a natural disaster, or the announcement at a press conference). However, exclusive news content is not always a scoop, as it may not provide the requisite importance or excitement. A scoop may be also defined retrospectively; a story may come to be known as a scoop because of a historical change in perspective of a particular event.[further explanation needed] Due to their secret nature, scandals are a prime source of scoops (e.g., the Watergate scandal by Washington Post journalists Woodward and Bernstein).