TED-Ed Lesson: In 1998, a school district removed one of American literature’s most acclaimed works from its curriculum. Parents pushing for the ban said the book was both “sexually explicit” and “anti-white.” The book at the center of this debate was Maya Angelou’s “I Know Why The Caged Bird Sings.” Why was the memoir so controversial? Mollie Godfrey digs into one of the most banned books of all time.