Spending a lot of time on the HW?
* Remember the syllabus that said you should expect to spend something 
  like 6-9 hours per week on this class outside of class, working 
  productively?  Even if you spend 6 hours trying to do the hw, did you spend
  more than 3 hours otherwise on the course?
* The point is that if you are spending a lot of time, that is perfectly
  normal for many people to succeed in this course.  Just be patient and 
  keep putting in the time...

hw2?
* I'll put something up tonight, or ...

Outline for today:
* Improving higher/lower game
  + option to quit in the middle.
  + check if it is a number before converting it to a number.
  + keep count of how many guesses it took them.
  + let them choose the range of numbers.
  + let them keep playing again if they want to.
* Note: optimal strategy is called binary search - choose the middle of the
  range always.  If you choose anything but the middle, the computer's answer
  might be one that results in you not cutting the number of possibilities
  in half.
  + called binary search because binary is base-2, and you are cutting the 
    number of possibilities in half each time.
  + binary search also used for looking up names in a phonebook, or looking
    up information in any sorted list.
  + if you are picking between 0 and 1000, the most number of guesses you
    would need is about log(1000).
* Other things: 
  + practice tracing programs on paper and in IDLE