CSC151 2007S, Class 54: What is Computer Science, Revisited?

Admin:
* An optional HW17 will be ready this afternoon.
* An optional replacement for the project will be ready this afternoon.
* Another homework replacement will be held in class today.  This one
  is required, but will only replace a HW if it is higher.
* Project grades ready tomorrow (I hope).
* ATTENDANCE REQUIRED TOMORROW

Overview:
* What is CS?
* Subfields of CS.
* Related Disciplines.