" Scientists  who study how the brain works have shown that children learn earlier - and learn more- than we once thought possible".

 Introduction to: Helping Your Preschool Child , US Department of Education, Office of Communication and Research, first published June 1993, revised 2002, 2005

"...skill development and brain maturation are hierarchical processes in which higher level functions depend on, and build on, lower level functions". Eric I. Knudson, James J. Heckman, Judy L. Cameron and Jack P. Shonkoff, “Economic, neuro- biological, and behavioral perspectives on building America's future workforce.” 

Proceedings of the National Academy of Sciences. www.pnas.org/content/103/27/1015.full.pdf 

What have we learned in the last years about the education of young children?