Eighth-grade teacher Ariel Sacks writes that meaningful collaboration among teachers is essential to quality teaching. She likens the process to scientists, who learn from each other and improve others' work, and to artists, who also follow and build upon others' creations. "Looking to both those disciplines, we can see that very few scientists or artists would really be successful without being involved in communities built around the work being done in their fields," Sacks writes.

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