Why thank-you notes are so great

I got a great thank-you note the other day.  It was thoughtful and
sincere and really made me feel like this person appreciated the
(actually pretty small) thing I did. 

It was also, of course,
totally unnecessary.  But that's why thank-you notes are so great. 
They're unexpected and a nice surprise.  They're free to the writer,
but worth a lot to the receiver.  It's rare that you can do something
so easy that's so well appreciated. 

So think about a person who's helped you or done something nice
who deserves your thanks.  Maybe it's a teacher, your counselor, your
boss, or a friend who helped you when you needed it.  Write a nice note of thanks and let them know you appreciate their help. 

If you need some tips to write a good one, here's a prior post.