R. baker, j. kalka, v. aleven, l. rossi, s. gowda, a. wagner, g. kusbit, m. wixon, a. salvi, j. ocumpaugh. towards sensor-free affect detection in cognitive tutor algebra. proceedings of the 5th international conference on educational data mining, 01 2012:

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Opinion polls reveal that many people believe that the military buildup of the 1980s came at the expense of pressing domestic problems such as environmental pollution and deteriorating educational and transportation infrastructure. in short, people are becoming aware of