Eugenia enjoying a music lesson together with preschool children in the Bulgarian village of Litakovo. (Photo: Daniel Lekov / World Bank)
In Bulgaria, where just 15 percent of Roma children…

Daphna Berman |

Most educational interventions are widely considered successful if they increase test-scores -- which indicate cognitive ability. Presumably, this is because higher test-scores in school imply…

Jishnu Das |