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The "flipped classroom" was being discussed in social lounges, in conference sessions, on the exhibit floor, on the hashtag and even at dinner. People wanted to know what it was, what it wasn't, how it's done and why it works.

"Seventeen months ago, I made my first flipped learning video. And then, unexpectedly, it happened: I crossed the century mark. That is to say, I made my hundredth video. What have I learned along the road between one and one hundred?"