The line in this blog that got me is:

"And yes, I know they're labeled a "distraction" in the classroom. But I also know that my son did 20 math problems in a row without crying or begging me to let him stop." 

I can relate to that sooooo well. I homeschool my son and he has a chew necklace and some kind of fidget when he's doing schoolwork. He's calmer and sits still longer and is able to do harder tasks as far as work. It's truly amazing to me and that's exactly my we wanted to share the things that work for us with everyone else struggling. There's not much worse than a kid that doesn't respond to bribes or treats not wanting to work on something complicated or even easy.

Rant over...This blog post is great