Congrats to You....
A couple of years ago I had two articles published by School Arts. I believe
they own the article, but I don't think they own the idea. I think you could
still teach a lesson about your subject to a group of teachers. If you are
concerned just change it a bit. You wouldn't be able to use your article as
a handout. I think of my Tie it all Up for Youth Art Month article ...we get
a lot of press about that project every year. For example the articles I
wrote cannot be submitted to Arts and Activities. I must say I was
disappointed in the renumeration I received since it took several hours to
write and the cost of photos. It does look good on a resume!