Previous research in the news

Context, messiness, and naming nonsolids:

http://well.blogs.nytimes.com/2013/12/23/to-smoosh-peas-is-to-learn/?ref=health&_r=0

http://www.theatlantic.com/education/archive/2013/12/messy-kids-learn-more/282095/

http://www.popsci.com/blog-network/kinderlab/view-here-babies-learn-faster-high-chairs

http://www.uiowa.edu/delta-center/samuelson-study.mp3

 

Variability and vocabulary growth:

http://blogs.edweek.org/edweek/inside-school-research/2010/12/variation_helps_toddlers_learn.html