[Respond] Consider possible topics: Current events.

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Following Vedantam, you could consider the causes of a current event. For example, think about why people voted a certain way in a recent election, or why a particular news story or YouTube video went viral. Also think about the causes of something ongoing, such as why the risk of auto accidents is higher among teenage drivers than among older motorists, or why the rate of teen pregnancy is the lowest it has been in twenty years.