In addition, low academic user perception quality and satisfaction levels are higher than the highly educated users; (4) different income differences.

In the past decade, even as income inequality has grown, some of the socioeconomic differences in parenting, like reading to children and going to libraries, have narrowed.

Puzzle play was found to be a significant predictor of cognition after controlling for differences in parents' income, education and the amount of parent talk, Levine said.