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At the center of our Milky Way galaxy is a supermassive black hole.

At the core of our Milky Way galaxy lies a black hole. Like all black holes, its gravitational pull is so strong that it swallows anything that ventures too close--even light.

Some 50 million Americans 65 and older currently get help from Medicare. But the program doesn't cover all of a patient's medications

Just after midnight on October 6, 2010, Kevin Systrom signed into his Apple App Store control panel. "Here we go," he thought. With a click, Instagram , the photo-sharing app he'd created with Mike Krieger, was open to the world