Common Core Flipped Classroom Khan Academy Software 
A Principal's Reflections
APRIL 23, 2012
Khan is the creator of Khan Academy. He began his keynote by sharing a video montage of Khan Academy highlights and then presenting some impressive statistics on usage. The catalyst for Khan Academy began some years ago with a Yahoo doodle Sal developed to help a family member with her struggles in math.
Hack Education
DECEMBER 30, 2019
Or the company will have to start charging for the software. The Flipped Classroom". It was probably Sal Khan’s 2011 TED Talk “Let’s Use Video to Reinvent Education” and the flurry of media he received over the course of the following year or so that introduced the idea of the “flipped classroom” to most people.
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