Q : Is it true Colby Landrum was paid compensation by the U.S. Government for injuries received while witnessing a UFO near Dayton, Texas, on December 29, 1980, when he was seven years old? Derek Britchford, London Colney, Herts. Q : Why is there a memorial to two airmen in Wolvercote, Oxford, dated from before World War I? P. Smith, Durham. Q : What is the difference between a disease that is infectious and a disease that is contagious? Chris Finney, Lincoln.