I wish I had taught my children to write thank you notes when they were young. I always ensured that they thanked people for gifts and such and only had the write thank you notes to people that sent gifts and were not there when the gift was open to receive the verbal thank you. But in hindsight, I think I probably did the a disservice by not requiring it for all gifts and experiences.
I read this post on StaySouthern.net entitled, How to Write a Thank You Note (and why you should). It was a very nice short read but completely got the point across. Thank you notes are a practice that can bring a little joy to the receiver. Think about it though, they took time and effort to give something to you.
I remember as a child, my mom would have my sister and I write thank you notes. I remember her writing it out so we would write it correctly. I have no idea how old I was.
Anyway, back to the post I read, the author gave specifics about how to compose a thank you card/note as well. She even gave examples of how her family gives thank you notes frequently and how it even blesses those who receive them that are not in the practice of giving them.
I think I may even up my thank you note giving a notch or two. 
I think it is much more important than which fork to use for which course (use them from the outside to the inside and you should be okay ) and can really bless someone who has blessed you.
Until next time, God bless,
Michele ºÜº