Mathematician U. was a great friend of his five-year old grandson. They discused everything including math and U. was very proud of the boys math talents. The child went to kindergarden; In two weeks the he ask U.to help with the difficult math problem: "There are four airplanes flying, then two more airplanes join them. How many airplanes are flying now? U. was very disappointed by the simplicity of the problem. "What confuses you?" he asked. The child says: " I know, of course, that 4 + 2 =6, but I cannot figure out what the airplanes have do with this!"
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