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Jan Palmer, a biology teacher at Central High School in Aberdeen, S.D., top right, leads her Advanced Placement/Rising Scholars biology class through a practice test. (AP Photo/Aberdeen American News, Kevin Bennett, File)
Photo by: John Davis
Jan Palmer, a biology teacher at Central High School in Aberdeen, S.D., top right, leads her Advanced Placement/Rising Scholars biology class through a practice test. (AP Photo/Aberdeen American News, Kevin Bennett, File)

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