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A new study finds that taking pictures of PowerPoint slides during an online presentation helped students remember the slide content better than for slides they did not photograph.

A year ago, the average successful slide deck contained 19 slides. Now it's around 16. So, should founders still be striving to shorten their decks?

Students often take camera-phone photos of slides during an instructor's presentation. But the question has lingered whether this practice helps students remember information.