4 - Dianna Cowern: Dead or Alive
The 3b1b podcast
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The Pythagorean Theorem
President james garfield came up with his own proof of the pythagoran theorem. Here, we ask you to come up with your own version and share it on Twitter @CNNOpinion. We'll be back in a week or so for another look at what's been going on around the world since our last story.
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