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Moreover , every number appears exactly once , so the EKG sequence is a permutation of the positive integers . " Egypt will always be my happy childhood , " said Saweris after bringing out platters of traditional Egyptian bean dishes , pita bread , salads and date pastries for the worshippers . In mathematical terms , " much of the complexity of the song of the canary ( Serinus canaria ) can be produced from simple time variations in forcing functions , " Tim Gardner of Rockefeller University and his collaborators declared in the Nov. 12 Physical Review Letters . Speaking of speediness and time , I've appreciated having a sleek digital clock that provides the time and date with exquisite precision ( http://www.atomic-clocks.com/ ) .