[caption id="attachment_101749" align="alignleft" width="150" caption="GSR technology could give an advantage to 'tyrannical' teachers, Ravitch says."][/caption]

A student’s physical reaction to a classroom lesson soon could be used to judge how successful—or unsuccessful—an educator is in keeping students engaged.

Researchers and Clemson University received a nearly $500,000 grant from the Bill & Melinda Gates Foundation in November to study Galvanic Skin Response (GSR) bracelets, which house sensors that measure a student’s physical reaction to learning—such as increased sweating—and uses the data as a way to grade an educator’s performance.

Wireless sensors produce...

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