Using para (not por) to express unequal relations/surprising facts

In Spanish we use the preposition para (not por) when we want to express that there is a surprising fact in relation to a general statement. 

Have a look and listen to these examples:

Here, the general statement is that all teenagers are irresponsible, however she is an exception.

Here, the surprising fact is that the results have been bad, despite being considered generally as a very good university.