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and please give us your report. Well, good evening to you Joan and to the next, this is K-A-9-E-H-V and in Seattle. And so this week's fun comes to us from Yeor Polia with a Russian mathematician who wrote one of the best books on math pedagogy I have ever had the privilege of reading. I showed up at a job interview with that book in hand at poor for a math teaching fellowship with that book in hand and I think the lady had decided to hire me within about five minutes. Here's the riddle. And so you should take out a pencil and kind of draw a little diagram. So, a bear, like a bear, like the animal, stands at a point P like Papa.