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Far from our galaxy, in the vast darkness of space, two massive black holes merged into a single, larger hole.

And now researchers say they have detected rumblings from that cataclysmic collision as ripples in the very fabric of space-time itself. The discovery comes a century after Albert Einstein first predicted such ripples should exist.

A fire and a riot broke out in a prison in the city of Monterrey in northern Mexico on Wednesday night, killing at least 52 people and putting 12 in the hospital, says Jaime Rodriguez Calderón, the governor of Nuevo León state.

The riot at the Topo Chico prison in Monterrey began with a dispute between two groups around 11:30 p.m. local time, Rodriguez said at a Thursday morning news conference. The prison was brought back under control at 1:30 a.m., Nuevo León state officials said earlier today.

Who is among the least likely to use online dating sites?

A few years ago, you would have been correct to guess college students or those in their early 20s, a group surrounded by peers and in the prime of their bar-hopping years. But a newly released Pew Research Center study finds the use of online dating sites by 18- to 24-year-olds has nearly tripled just since 2013, making this group now the most likely to use the Web to find partners.

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DAVID GREENE, HOST:

Global markets, for the moment, seem to be tanking, and we have David Wessel on the line. He's director at the Hutchins Center at the Brookings Institution and a contributing correspondent to the Wall Street Journal. Hey, David.

Saying a maritime force will contribute "critical information and surveillance to help counter human trafficking and criminal networks," NATO Secretary-General Jens Stoltenberg announced that the alliance has ordered ships to the Aegean Sea, a focal point for smuggling migrants and refugees from Turkey to Greece.

The mission will include both naval ships and aircraft and will start "without any delay," Stoltenberg said.

After enduring winds that topped 120 mph and waves that tossed their ship around, passengers of the Anthem of the Seas are on dry land Thursday, having cut short a planned cruise to the Bahamas. Royal Caribbean says the storm that damaged the ship and forced its return to New Jersey "far exceeded forecasts."

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Girl Scout Cookie Flavors Vary By Region

19 hours ago
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DAVID GREENE, HOST:

Further unraveling a project that's been a sign of cooperation, North Korea has ordered all South Koreans to leave a jointly run industrial complex, after South Korea announced it would suspend work there in retaliation for Pyongyang's recent missile launch and nuclear test.

North Korea was also freezing all assets related to the Kaesong Industrial Complex and cutting two communications hotlines between the neighboring countries.

From Seoul, reporter Haeryun Kang tells our Newscast unit:

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