Three teachers answer questions submitted by Slate readers.  Today's big question: "Why do some teachers continue to assign hours of homework when studies show it's not helpful?" Hosted by Matt Collette of the Teacher Project at the Columbia University Graduate School of Journalism.

- Andrew Ahn, a teacher and adviser at City as School, an alternative high school for 11th and 12th grade transfer students in New York

- Tessa Benau, a 10th grade math teacher from Vanguard High School in New York.

- Ray Salazar, a high school english teacher in the Chicago Public Schools. He writes the White Rhino blog about education.

Got a question for our teachers? Ask it here. 

This episode is sponsored by The Great Courses, offering over 500 lecture series taught by top professors and experts, available in audio and video formats. One example: "The Art of Teaching." Go to thegreatcourses.com/teacher for a special, limited time offer.

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