This one is even news to me! Not only do I appreciate the information, you've just given me something to further investigate and prop up my ever growing library of information on this subject.
Well done Linda!!
Also, I have just posted the second playground episode, would love to know what you think. I'm excited about the next batch I'm writing, I think I told you that I plan to talk about this very issue, and you are definitely a part of the inspiration for that :)