I don't find the description or the examples here very well explained. What does call/cc do? What does cc do? what is this code, or is it just a comment?

  (continuation of 3 \* (f() + 8))(result) ;

The descriptions are just hard to parse:

  The value passed to the continuation is the return value of the call.
  
  During the execution of the expression body, the variable current-continuation is bound to the current continuation. If invoked, current-continuation immediately returns from the call to call/cc ...

And the initial 'teaser' is explained later, but not demonstrated by showing actuial code for assert and amb.