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In 2003, a hospital nurse named Charlie Cullen was arrested under suspicion of injecting patients with lethal doses of a variety of medications. He is now considered one of the nation's most prolific serial killers. Journalist Charles Graeber explains how the hospital system failed to stop Cullen.

Advertisers want to hear what you have to say, and many are about to roll out new kinds of ads you can actually have a conversation with. Marketers are hoping to leverage the power of voice and the kinds of technologies that power Apple's Siri to start selling us all sorts of things.

Washington, Los Angeles, New York and San Francisco were among the cities taking action following the blasts.

Literary magazine Granta's "Best of Young British Novelists" issue reflects the changing face of U.K. literature.

Even as the shock and horror of the deadly explosions at the Boston Marathon had yet to subside Monday, people were turning to online tools to check on the safety of their friends and family who were at the event. The latest estimates of the casualties include more than 3 dozen people injured, with two dead.

Multiple people were injured by an explosion near the finish line of the Boston Marathon today. Melissa Block talks to Tovia Smith for more.

A new analysis of government data finds that antibiotic-resistant bacteria that cause human illness were widespread in supermarket meat samples tested. The implications are significant: that the bacteria had become resistant to antibiotics back at the farm because farmers were overusing them.

Update, 12:15 a.m.: "An unbelievable tragedy" -- that's how D.L. Wilson of the Department of Public Safety described Wednesday night's fertilizer plant…

Most people think of Superman as a native of Krypton, or perhaps the rural Kansas village of Smallville. Not so fast, say Clevelanders. The creators of the Man of Steel grew up in the city that steel built, and this year, Cleveland is pulling out all the stops for the superhero's 75th birthday.

As the day dawned, officials said an estimated 5 to 15 people were killed and more than 160 were wounded. It was feared those numbers might go higher. The cause of the fire that led to the explosion at a plant near Waco is under investigation.