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For the second time this week, markets were briefly halted trading as the market fell 7 percent, triggering a "circuit-breaker."The New York Stock Exchange halted trading less than 10 minutes after the market opened, when the Dow Jones Industrial Average plummeted 7 percent. By the end of the day, the Dow set an all-time point drop, losing more than 2,300 points. The drop marked a nearly 10 percent fall for the Dow from yesterday's totals. Six of the largest eight one-day point drops have taken place in the last three weeks. Thursday's drop ranked fourth in the largest decine based on percentage, only trailing the market crashes of 1929 and 1987. In one month, the Dow has lost 28% of its value. Stock exchange rules require that trading be halted for 15 minutes in the event of a 7 percent loss. Trading will be halted again for 15 minutes in the event of a 13 percent loss, and trading will end for the in the event of a 20 percent loss. 959

For nearly a decade, the US Mint has produced "America the Beautiful" quarters that pay homage to various sites in all US states and territories. But the newest quarter to be minted got quite a response on social media this week. The newest coin, which will enter circulation next month, will honor American Samoa by depicting an image from the National Park of American Samoa."The reverse (tails) design depicts a Samoan fruit bat mother hanging in a tree with her pup," US Mint said in a description of the coin. "The image evokes the remarkable care and energy that this species puts into their offspring. The design is intended to promote awareness to the species’ threatened status due to habitat loss and commercial hunting. The National Park of American Samoa is the only park in the United States that is home to the Samoan fruit bat."American Samoa is a US territory in the Pacific Ocean that is home to 55,000 residents. Unlike other territories such as Guam or Puerto Rico, the island's natives are not full-fledged US citizens. Instead, they are considered US nationals. 1094

Five people were stabbed Friday at a shopping mall Manchester, northwest England, police say.Greater Manchester Police said in a statement that counter-terrorism police were leading the investigation into the incident at Arndale shopping center and that a 40-year-old man had been arrested on suspicion of serious assault.Police added that as it is still "early stages" they are "keeping an open might about the motivation of this terrible incident and the circumstances."A spokesperson for North West Ambulance service told CNN earlier that they had received "multiple" calls for help at 11:17 a.m. local time and that several people were being treated by emergency services.The spokesperson added that a "number of resources" -- one ambulance, two hazardous response vehicles and a physician -- had been deployed to Arndale Center.A large number of officers were pictured at the scene via social media posts 921

Guadalajara had been enjoying a sweaty summer for the past few weeks until the weekend brought a shocking surprise.The Mexican city woke up Sunday morning to more than 3 feet of ice in some areas after a heavy hailstorm swept through the region.As government officials scrambled to contain the damage and clear up roads, residents captured jaw-dropping footage of vehicles and residences swallowed by ice.Enrique Alfaro Ramirez, the governor of Jalisco, of which Guadalajara is the capital, said he'd never witnessed scenes like those he saw Sunday morning."Hail more than a meter high, and then we wonder if climate change exists," he said on Twitter.The government of Jalisco has been working with the Mexican Army and Guadalajara and Tlaquepaque authorities to clean and remove hail from all public roads, the governor said, as well as support citizens whose homes were affected.Ramirez said Sunday afternoon there had not been any reported injuries or fatalities.So, how did this happen?Low pressure extending south from the US and Mexico border had been forecast to contribute to developing storms along the boundary separating different air masses, CNN Meteorologist Michael Guy said."Once these storms developed, all the ingredients came together for there to be this strange hailstorm over Guadalajara," he said.The result -- accumulations of more than 3 feet of hail in some areas across the region, Guy said."The last storm along the front died out and created an outflow boundary," and the city's mountainous location helped a new storm rapidly develop, Guy added.The city is nearly 5,000 feet above sea level and usually maintains a temperate climate, Guy said. The summer months are often rainy and severe weather isn't unheard of, because of the city's elevation.The rainy season is considered June through September, Guy said."However, this was a case where atmospheric and topographic ingredients came into play to cause a freakish hail storm," he said. 1981

Here is something you may not know about the moon: Earth's clingy best friend is also the site of one of the largest-known impact craters in our entire solar system. Essentially, something caused a giant hole on the moon billions of years ago, and astronomers have just discovered that there's something big -- really big -- buried underneath the surface. 367