1.   Now the mystery is beginning to unravel.

2.   Still, as cases began to mount, the mystery began to dominate bull sessions, telephone chats and hallway discussions among epidemiologists and infectious disease specialists.

3.   That was when Hahn examined the frozen chimpanzee organs, and the mystery began to crack.

4.   The mystery began to unfold about three days ago.

5.   The mystery is beginning to lift on the origins of the gun that killed Gillespie.

6.   This is where the mystery begins.

7.   Yet in many ways the mystery was just beginning.

8.   But quickly mysteries began to mount.

9.   From the moment you arrive, the mystery begins and only ends when you leave.

10.   The biological mysteries begin at the beach.