To me, this seems like one of those issues that's easy for a human to parse, but hard for a computer. For example: * Terrorist attack in London * Terrorist at

To me, this seems like one of those issues that's easy for a human to parse, but hard for a computer. For example: * Terrorist attack in London * Terrorist attacks in London The only difference is the plural. However, the first is probably time-sensitive, looking for the most recent attack that's in the news right now. The second is more general.