1.   As Congress determines what happened last year, it should also lay the groundwork for legislation to prevent it from happening again.

2.   As investigators sought to determine what happened in the minutes before the crash, passengers described a harrowing ordeal.

3.   Leaving the cars as they were when the accident occurred helps the police determine what happened.

4.   Police are trying to determine what happened to Kenneth Conrad, who some suspect was killed by mobsters in Deerfield.