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But it was new to the modern world, and it had the great weight of Aristotle against it. Of late years the greatest pest has been the Mexican boll weevil. There is some question whether or not it is a binary, for, while the twin stars are both moving in the same direction in space with comparative rapidity, yet conclusive evidence of orbital motion is lacking. It is not possible to describe the details of all these, but two of the most recent will be mentioned.