While it is becoming increasingly common (and easy) for lectures to be placed online as videos or podcasts, such media can often be very limited in their utility. For example, I missed a lecture last ...

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Imagine you are taking a biology course. You're studying for an exam and would like to revisit the professor's explanation of RNA interference. Fortunately, a digital recording of the lecture is ...

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CAMBRIDGE, Mass.--Imagine you are taking an introductory biology course. You're studying for an exam and realize it would be helpful to revisit the professor's explanation of RNA interference.