11.   Here is where Nobel Prize winners mingle with graduate students, and where string theory was born.

12.   If string theory is correct, Witten said, an automatic result will be an interpretation of gravity in terms of quantum mechanics.

13.   In the last three years, physicists have come to realize that various versions of string theory are linked to one another in subtle ways.

14.   It all depends, of course, on how string theory holds up over time.

15.   It was not, yet, and when infinities reared their head in supergravity, some of its ideas were salvaged and woven into string theory.

16.   Many theories such as the string theory, which attempt to unify gravity with the other forces, require extra dimensions of space-time.

17.   Now, string theory may have the potential to enhance our picture of reality.

18.   Proponents of so-called string theory have long believed that the theory is the bridge between the two.

19.   Since its inception, string theory has been criticized for producing ideas that seem as experimentally untestable as they are mathematically elegant.

20.   Some of the mathematical notions which people associate with string theory are very appealing.