Providing feedback to students, explaining why their answers were right or wrong, and then allowing students to continue to work on a problem until they have it right and master the concept produces statistically significant gains in student learning.

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This brief moment, which is quickly cast aside as Flash and Wonder Woman deal with Mirror Master, establishes an important concept: the old lines of good and evil are considerably murky, now.

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Yielding is another concept Ms. Bravo's tai chi master, Sat Hon, taught her, and it has proved helpful in negotiating the city.

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