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A new species of carnivorous theropod dinosaur has been identified from the fossilized remains discovered in the 1990s in northeastern Utah and Wyoming, the United States. A group of Allosaurus jimmadseni attacks a juvenile sauropod dinosaur. Image credit: Todd Marshall. The newly-discovered dinosaur belongs to Allosauridae, a group of small to large-bodied, two-legged carnivorous dinosaurs that lived during the Jurassic and Cretaceous periods. Dubbed Allosaurus jimmadseni , the species inhabited the flood plains of western North America during the Jurassic period. The ancient creature was 8 to 9 m (26-29 feet) long and had a mass of around 1.8 metric tons. It had relatively long legs and tail, and long arms with three sharp claws. At 155 million years old, Allosaurus jimmadseni is the geologically-oldest species of Allosaurus predating the more well-known Allosaurus fragilis . The new species is distinguished by a number of unique features, including low crests ...

The ruins of more than 130 secret doors on the Great Wall, one of the great wonders of the world, were recently revealed through high-resolution images by a research team. According to Xinhua, based on more thorough image analysis and field trips to the Great Wall, the team found that each secret door was designed to be compatible with each local’s topography. According to experts, these secret passage s are for scouts to pass through, while some are built as communication channels between the inside and outside of the Great Wall or for trade. trade in ancient times. According to some historical documents from the Ming Dynasty (1368-1644), nomadic tribes were allowed to use such secret gates to graze their livestock between Qinghai and Hetao, northwest China. China, an area with abundant water and grass at that time. Zhang Yukun, a professor from Tianjin University who also led the research team, said it was possible because some large secr...