How high can a gymnastic score be?

Gymnasts have just successfully competed in St Louis, Missouri for positions on the USA Olympic team.  As you watch their performances don't you wonder how their scores are determined and what the top score could be? (It's not a 10 anymore!)

Use the video below to see the history of when Nadia Comanici performed the first ever perfect Olympic routine in the 1976 Olympics.

But the scoring has changed dramatically.