I was tired and hungry after a long day of work. When I walked into the living – room, my 12 – year – old son looked 1 at me and said “I love you.” I didn’t know what to say.  2  several seconds all I could do was to stand there and looked down at him. My first thought was he must need 3   while doing his homework 4 he was trying to prepare me for some 5 . Finally, I asked, “What was that all about?” “ 6  ,” he said. “My teacher said we should tell our parents that we love them and see what they say. It’s an experiment.”