And, as he has frequently noted, there's the uncertainty of external events like the weather, which sometimes require money be moved around. (nystateofpolitics.com)
At this level, conflict may be caused by external events, but the story focuses on the individual's internal struggle with personality or with social and cultural heritage. (religion-online.org)
Activity could also reflect external events such as reward that, by virtue of being tightly coupled to the upcoming movement, can be readily anticipated. (journals.plos.org)