A new study found that in many parts of New York City, schools are way more segregated by race and class than the surrounding neighborhoods.

Here to explain why, from the group that crunched the numbers and generated the map: Clara Hemphill, founder of InsideSchools at the New School's Center for New York City Affairs.

"I think school choice often makes things worse," said Hemphill, explaining that many affluent parents spend money and time figuring out how to apply to better schools while lower-income parents tend to sign their kids up the day before their local school starts.

Maps of multi-ethnic NYC neighborhoods show segregated schools aren't always due to seg housing. -@ClaraHemphill pic.twitter.com/lngJSRJIoX

— Brian Lehrer Show (@BrianLehrer) December 17, 2015

White parents say they want diversity but won't send kids to school with "lack of prepared students". @BrianLehrer @ClaraHemphill

— Insideschools (@Insideschools) December 17, 2015

See an interactive map of NYC neighborhoods, housing/school segregation: https://t.co/1OGs6dqRJY

— Brian Lehrer Show (@BrianLehrer) December 17, 2015