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Fraternal twins tend to run in families, and scientists think they've identified genetic variations at play. Understanding that might someday help predict who is more likely to have a risky pregnancy, and might also help treat fertility problems.

A former reserve deputy in Oklahoma who said he mistook his gun for his Taser when he shot and killed a suspect has been convicted of second-degree manslaughter. Robert Bates, 74, was a volunteer with the Tulsa County Sheriff's Office when he killed Eric Harris during a sting operation in April 2015.

Baltimore police said a police detective shot and injured a boy after mistaking a replica pistol in his hand for a real gun.

Baltimore Police Commissioner Kevin Davis told reporters that two plainclothes detectives were driving in East Baltimore on Wednesday afternoon and saw the boy with "what looked like a firearm." Here's what Davis said happened next:

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In the 1990s Chuck Slaughter built the online clothing retailer, TravelSmith, from a startup to a company with sales in excess of $100 million a year. Then he signed up to be an Avon lady.

"[Avon] is the original social network business. In some ways it's better than Twitter and Facebook because Avon figured out how to monetize the social network," Slaughter says over coffee at a café in Oxford, England.

For those who experienced it, Mountain Stage on April 28, 1991 was an unforgettable one to say the least. That day R.E.M., unquestionably one of the most popular bands at that time, emerged from a brief touring hiatus to perform on Mountain Stage in Charleston, WV.

It's the stuff of legend. Nearly everyone we come across has some sort of memory from that night.

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Airstrikes in Syria's largest city killed more than a dozen people at a well-known hospital, says aid group Doctors Without Borders, adding that the violence claimed one of the last pediatricians working in Aleppo.

"We are outraged at the destruction of Al Quds hospital," the group said in a tweet Thursday, saying that the facility included an intensive care unit and an emergency room.

A friend of the pediatrician who died told NPR's Alice Fordham via Skype that Mohammed Wassim Moaz was "very kind" and that the children in Aleppo "love him very much."

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Lately, it's been a political guessing game of which Donald Trump is going to show up.

In the past 24 hours alone, the whiplash between what rival-turned-uneven-surrogate Ben Carson called the "two different Donald Trumps" was on bold display.

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