Jane moves at v = -0.3c relative to Fred.       gamma = 



                                      general                in this case
                                   -----------------       -------------------
      Lorentz transforms:    x'  =  gamma * (x - v t)   =  gamma*(x + 0.3 t)

                                                  vx
                             t'  =  gamma * (t - ----)  =  gamma*(t + 0.3 x)
                                                  c^2


    Event                        Fred                       Jane
------------------------------------------------------------------------
                            x=           t=           x'=        t'=
                                             
1.  Line of men 
    starting at x=0,
    1 m apart,
    raise hand at
    t = 0

     man at x=0             0          0          

     man at x=4             4          0

     man at x=8             8          0

     man at x=12           12          0 




2. Man at x=0 has cold.     0          0

    At t = 5, coughs.       0          5

    At t = 10, sneezes      0         10




3. Doggie runs across 
   field at speed 0.2c
   to left.  At t=0,
   doggie at x=8.           8          0

   Dog barks at t=5         7          5

   Dog barks at t=10        6         10




4. Bird flies to right
   at 0.9c.  At time t=0,
   bird at x=-3.           -3          0 

   Bird chips at t=0.      

   Bird meets Dog           6         10



5. Man with cold flashes
   laser to right at t=8.   0          8

   It strikes flower
   3 seconds later.         3         11