THE MATH OF KHAN

摘要

In August 2004, Salman Khan agreed to help his niece, Nadia, with her math homework. Nadia was headed into seventh grade in New Orleans, where Khan had grown up, but she hadn't been placed in her private school's advanced math track, which to a motivated parent these days is a little bit like hearing your child has just been diagnosed with Lou Gehrig's disease. In particular, Nadia was having trouble with unit conversion, turning gallons into liters and ounces into grams.