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Numbers & Operations
Average speed and Rich Eisen's ineptitude in the 40-yard dash
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Structure and Function of Schools
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lesson duration 02:49
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Life Sciences
Isabel Behncke: Evolution's gift of play, from bonobo apes to humans
lesson duration 07:02
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Motivation and Emotion
Gettysburg College Commencement 2012 - Jacqueline Novogratz
lesson duration 21:13
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