1.   But the greatest unknown is the psychological and emotional toll that returning to work will have on the Wall Street community.

2.   How many people will come forward and request a cleanup is perhaps the greatest unknown.

3.   Poarch believes the greatest unknown in bass spawning is the effect of sunlight.

4.   The ability of this body to stand up to the weekly beatings may be the greatest unknown Johnson will confront this season.

5.   The greatest unknown here is your health.

6.   The greatest unknown is how consumers, still warming to the potential of digital entertainment, will receive the technology.

7.   Ticket sales, begun this week, represent the greatest unknown on the revenue side of the Olympic balance sheet.