240. A constellation is an area on the celestial sphere in which a group of stars forms an imaginary outline or pattern, typically representing an animal, mythological person or creature, or an inanimate object. The origins of the earliest constellations likely go back to prehistory. (44 words)

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241. Investigators also compared those microbes with those living in 52 other soil samples taken from all around the planet. The park had organisms that also exist in deserts, frozen tundra, forests, rainforests, and prairies. Antarctica was the only area that had microbes that did not overlap with those found in Central Park. Only a small percentage of the park’s microbes were found to be already listed in databases. (68 words)

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242. Tourism is a challenging sector on which divides statistics since businesses serving tourists, also service local people. Therefore, it is not straightforward to estimate how much business sectors' revenues and how many jobs are due to tourist expenditures. (38 words)

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243. Every morning, no matter how late he had been up, my father rose at 5:30, went to his study, wrote for a couple of hours, made us all breakfast, read the paper with my mother, and then went back to work for the rest of the morning. Many years passed before I realized that he did this by choice, for a living, and that he was not unemployed or mentally ill. (70 words)

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