What are those kids doing on that playground?

Improving their math MCAS scores, it turns out. But only under particular circumstances:

In schools where fourth graders had new playgrounds, 25 percent more kids passed the math MCAS. And that figure remained true after(researchers) controlled for factors such as demographics and the number of students receiving free or reduced-price lunches.

Really interesting little article. Take a look!
Maybe instead of spending more on tutoring and such, we should be spending more on playground equipment? And who was it that said that the schools weren't in the business of building playgrounds...?