" 
 :With respect, it seems to have a fairly solid base of reviews and, whilst it doesn't have all the pretty trappings of funding that the other two have, it seems reliable. It doesn't look to have been around for that long, but has built a steady core of reviews and articles. We haven't agreed on sources before. I think we will have to agree to disagree on this. As the claim (the statement regarding the laughter and shouts of children) isn't an extraordinary one, the source isn't required to be extraordinary, just reliable and verifiable. -   "