Made a deal with the kid. If he completes @khanacademy 6th grade over the summer, I'll replace his cracked phone. It's on. #quidproquo
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@khanacademy He says the videos are cool, but the protractor won't work on a Mac. And who knows what he's doing here:pic.twitter.com/ewqKw0UZPL
Thanks. Twitter will use this to make your timeline better. UndoUndo
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