1.  The long line of men raising their
      hands lies along the x-axis in 
      Fred's space-time diagram.
      Do those events also lie along the
      x-axis in Jane's diagram?





  2.  The man with a bad cold lies
      along the y-axis in Fred's diagram.
      Does he also lie along the 
      y-axis in Jane's diagram?





  3.  Consider the cough and the sneeze.
      What is the time interval between
      these two events according to Fred?
      According to Jane?






  4.  Consider these two events:
          the bird chirps
          the bird meets the dog

      What is the time interval between
      the events according to each observer?

      What is the space interval between
      the events according to each observer?
       





  5.  How fast is the bird flying,
      according to Jane?





  6.  (optional)  How fast does the laser beam
      travel, according to Fred?  
      According to Jane?