Posted by @NatasaBrouwer on Sept. 19, 2016, 6:40 p.m.

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Perusall ( is an e-book platform with collaborative annotation that aims to keep students on track before class. Perusall is free. Perusall is developed at Harvard by Gary King, Brian Lukoff, and Eric Mazur

See presentation about Perusall by Gary King:

One page description for instructors (pdf)

Demo on YouTube:

Perusall in Physics

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