1.   Arching over these questions is the central mystery of just where the Jews of Eastern Europe came from.

2.   A central mystery is why Clinton would keep Dozoretz informed while failing until the last minute to notify the Justice Department he was considering a pardon.

3.   But the central mystery left by the hearings is the role of Huang, whose background raised serious doubts in Sullivan from the start.

4.   Finding the wreckage is not likely to resolve the central mystery about whether the crash was an accident or suicide.

5.   From that emerged what came to be seen as the central mystery of AIDS -- how can so few viruses be killing all those white blood cells?

6.   Now the notion has cropped up outside of philosophical tracts, as physicists have identified nothingness to be the central mystery of the origin and structure of the universe.

7.   The central mystery of the disaster is the cause of the blasts.

8.   The question of how far outside the law Culhane went to accomplish that change is the central mystery that gives the book its tension.

9.   The technique reaches to the central mysteries of life and death.

10.   They repeatedly enter unlocked and unguarded storage rooms to pilfer files in their quest to solve the central mystery of the film.