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Hamas may skip cease-fire meeting with Israel after strike on school, Ukrainian troops and Russian reinforcements gearing up for confrontation, Paris Olympics end with U.S. on top, controversy over gymnast's bronze medal, inspiration for fitness journey after Olympics, land near Jackson Hole, Wyo., becomes bargaining chip for sale, Gobekli Tepe in Turkey is world's first known sanctuary

Gobekli Tepe Archaeological Site and Lunisolar Calendar

Gobekli Tepe in Turkey may house the world's oldest lunisolar calendar and serve as a memorial to a comet strike 13,000 years ago, leading to an ice age and extinction of large animals.