; ▁Co - Pr incipal ▁Investig ator : A y ush ▁Gu pta ; ▁Organ ization : Univers ity ▁of ▁Maryland ▁College ▁Park ; ▁ 0 6 / 1 5 / 2 0 1 3 ▁Physics ▁Education ▁Research ▁User ' s ▁Guide : ▁A ▁Web ▁Resource ▁for ▁Physics ▁Edu c ators ▁# 1 2 4 5 4 9 0 ; ▁Princi pal ▁Investig ator : S ar ah ▁McK agan ; ▁Co - Pr incipal ▁Investig ator : B ru ce ▁Mason , ▁Beth ▁C unning ham ; ▁Organ ization : American ▁Association ▁of ▁Physics ▁Te ach ers ; 0 5 / 0 1 / 2 0 1 3 ▁Physics ▁Education ▁Technology ▁Project ▁# 0 4 4 2 8 4 1 ▁Princi pal ▁Investig ator : Car l ▁W iem an ; ▁Co - Pr incipal ▁Investig ator : No ah ▁F inkel stein , ▁K atherine ▁Per kins ; ▁Organ ization : Univers ity ▁of ▁Colorado ▁at ▁B ould er ; 0 6 / 0 1 / 2 0 0 5 ▁Physics ▁and ▁Chem istry ▁Education ▁Technology ▁Project ▁# 0 8 1 7 5 8 2 ; ▁Princi pal ▁Investig ator : K atherine ▁Per kins ; ▁Co - Pr incipal ▁Investig ator : Michael ▁Dub son , ▁No ah ▁F inkel stein , ▁Robert ▁Par son , ▁Carl ▁W iem an ; ▁Organ ization : Univers ity ▁of ▁Colorado ▁at ▁B ould er ; 0 8 / 0 1 / 2 0 0 8 ▁Exp and ing ▁Ph ET ▁Inter active