i-app Mathematical Formulas

http://itunes.apple.com/us/app/mathematical-formulas/id312977094?mt=8

Teacher Quality, Status Entwined Among Top-Performing Nations

http://www.edweek.org/ew/articles/2012/01/12/16teachers.h31.html?tkn=TYSFnrQ1oyyHpbISYYHQ4BF4HxXoefJKwaaw&cmp=clp-edweek&intc=EW-QC12-EWH