Calander:
   
   1) Two days ago I was 13, next year I shall be 16. What is the date
      today and when is my birthday?
      
   2) Which of these years was a leap year:
   
             a) 1974
             b) 182O
             c) 1O66
             d) 1991
   
   3) Use your calculator to find out how many hours there were in the
      years 16OO and 16O1.