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Oliver Sacks, a neurologist and best-selling author who explored the human brain one patient at a time, has died of cancer. He was 82.

Sacks was best known for his books The Man Who Mistook His Wife for a Hat and Awakenings, which became a 1990 feature film starring Robin Williams and Robert De Niro.

Updated at 12:10 p.m. ET

Three refugee children who were rescued from a minivan as they were being smuggled into Europe have reportedly disappeared from a hospital where they were being treated for dehydration.

Meanwhile, there were more arrests in a similar case in Austria last week in which 71 migrants were found dead in a truck.

Oliver Sacks, the famed neurologist and best-selling author of books such as The Man Who Mistook His Wife for a Hat, died of cancer today in New York City at the age of 82, a long-time friend and colleague has confirmed.

The London-born academic's 1973 memoir Awakenings, about his efforts to use the drug L-Dopa to bring patients who survived the 1917-1928 encephalitis epidemic out of their persistent catatonic state, was turned into a 1990 Hollywood film starring Robin Williams and Robert De Niro. He was the author of a dozen other books.

When a wispy-haired, septuagenarian senator from Vermont with a Larry David-style and a life-long passion for talking about income inequality decided to run for president, not many took him seriously.

That's especially true, considering that senator, Bernie Sanders, was going up against the New York Yankees of Democratic politics — the Clintons.

But now Sanders is gaining in the polls, including in the gold-standard poll in Iowa — out Saturday night.

A motive remains elusive as investigators in Texas try to determine why a 30-year-old suspect in custody would have gunned down a sheriff's deputy while he was fueling his patrol car at a gas station near Houston.

Shannon J. Miles, 30, was charged Saturday in what authorities have described as an "execution-style" killing of 47-year-old Harris County Sheriff's Deputy Darren Goforth.

On a Saturday morning, in a group of Rio de Janeiro's notoriously violent shanty towns, or favelas, heavily armed pacification police stand on one side of the street, on the other side, protestors call for them to withdraw.

On the protest side, Mayse Freitas lists the people she knows who have been injured or killed in shootouts in the area recently.

"I'm a mother and a grandmother," Freitas says. "I don't want my children or grandchildren to be next."

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Last November, voters in California overwhelmingly approved Proposition 47, which lets people with some nonviolent felonies petition a court to reduce their crimes to misdemeanors. And that has opened up new opportunities for many former offenders.

Take 21-year-old Sofala Mayfield, for instance. Mayfield's life began to fall apart in his teens, after his grandmother suffered a stroke and his mother fell back into drug addiction.

To a visitor, it seems like a curious bit of territory for the Turkish military and the Kurds to be fighting over: steep rocky hills covered in brown windblown grass divided by patches of green forestland.

But if you get off the main road, and follow a gravel track into the hills, a makeshift camp emerges. This is where Kurdish activists have put themselves in the line of fire between the Turkish army and the youth faction of the Kurdistan Workers Party, or the PKK.

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