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Once day, a professor made an experiment on bugs’ behavior. He put the bugs in the 20 centimeter- high box and closed the top of the box. Bugs were in the box day by day. As the bugs jumped, their head crashed the box roof. The felt sick and then, they jumped not higher than 20 centimeter so their head would not crash the roof. They did it day bay day and it became their habit. One day, the