Bad teaching is a common explanation given for the disastrously inadequate public education received by America’s most vulnerable populations. This is a myth. Aside from a few lemons who were notable for their rarity, the majority of teachers I worked with for nine years in New York City’s public school system were dedicated, talented professionals. Before joining the system I was mystified by the schools’ abysmal results. I too assumed there must be something wrong with the teaching. This could not have been farther from the truth. Teaching French and Italian in NYC high schools I finally figured out why...