A puzzle: red, white, and blue weights http://boingboing.net/2017/08/11/martin-gardner-puzzle-red-wh.html …pic.twitter.com/RlB4a8q1lW
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A puzzle: red, white, and blue weights http://boingboing.net/2017/08/11/martin-gardner-puzzle-red-wh.html …pic.twitter.com/RlB4a8q1lW