Valerie Serrin still remembers vividly her anger and the feeling of helplessness. After getting a C on a lab report in an introductory chemistry course, she went to her teaching assistant to ask what she should have done for a better grade.
The teaching assistant, a graduate student from China, possessed a finely honed mind. But he also had a heavy accent and a limited grasp of spoken English, so he could not explain to Ms. Serrin, a freshman at the...
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