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Corporate ties to the NRA aren't the only elements undergoing scrutiny after a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, that left 17 dead on Valentine's Day. Broward County Sheriff Scott Israel said he's investigating claims that some Coral Springs police officers saw several of his deputies outside the building after the shooting began.

Convective weather, in which warm air currents rapidly push high into the sky and form plumes of thunderclouds, can be destructive. It is widely listed globally behind typhoons, earthquakes and floods for destructiveness. Extreme weather events can happen in an area as small as a few dozen square meters, though it usually affects dozens of or several hundred square kilometers. Convective weather is typically short-lived as well: Some events may last for only a few minutes.

Costa Cruises plans to quickly expand the application of this program to the whole country to significantly improve embarkation efficiency, according to Mario Zanetti, president of Costa Group Asia.

Construction of the infrastructure for the major line of China's second Sino-Russian crude oil transmission pipeline will be completed by the end of this month, said Hu Weijun, chief engineer of Jiagedaqi section of the project.

Copper accounts for more than half of Chile's exports. About one-third of Chile's copper production is now sold to China. This could grow, as China's production of electric vehicles grows.