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There may be an octopus arms race underway. And that's not even a joke about tentacles: Octopuses are actually fighting, and potentially using weapons.

The creatures are hardly team players under the best of circumstances.

"Octopuses in general are regarded as fairly solitary animals," says Peter Godfrey-Smith, a marine biologist at the City University of New York. He is studying octopuses in Australia's Jervis Bay — specifically, the common Sydney octopus, also known as the gloomy octopus.

The White House announced Sunday that President Obama is changing the name of North America's highest peak.

Mt. McKinley — named after William McKinley, the 25th president, who served in the White House until his assassination in 1901 — is returning to its traditional Alaska Native name, Denali.

Obama will make a public announcement of the name change in Anchorage Monday, during a three-day visit to Alaska.

Teenagers often feel bound by their parents' rules, and many young people feel isolated at some point, separated from the rest of the world.

But what would life be like for a young woman who was literally isolated — and bound by rules designed to save her life?

It's a question that author Nicola Yoon explores in her new novel for young adults, Everything, Everything. For 18 years, her lead character, Madeleine, has been kept inside a sterile house, interacting only with her mother and her nurse.

The California condor is big. In fact, it's the largest flying bird in North America with a wingspan of 9 1/2 feet.

Michael Mace, curator of birds for the San Diego Zoo Safari Park, tells NPR's Arun Rath that the condor "is like the 747 compared to a Cessna if you look at it proportionally with other species like eagles and turkey vultures."

Mace works in a condor power line aversion training program at the zoo. It was developed to address the condors' unfortunate run-ins with power lines.

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Chinese authorities have arrested 197 people who are accused of spreading rumors on social media about the recent stock market crash and the deadly explosion at Tianjin earlier this month.

Oregon Sen. Jeff Merkley announced on Sunday that he will support the White House-backed nuclear deal with Iran.

Merkley becomes the 31st Senate Democrat to endorse the agreement publicly, leaving the Obama administration just three votes shy of having enough votes to sustain a veto of a congressional resolution of disapproval — that is, of being able to advance the deal over Republican objections.

At the start of her campaign, Clinton was seen as the inevitable candidate of the Democrats. But she has spent much of the summer fending off questions about her private email account during her time as secretary of state. Bernie Sanders is gaining on her in the polls. And there's a looming possible challenge from sitting vice president Joe Biden.

A larger-than-life bronze statue of Jefferson Davis was taken down at the University of Texas today after standing on the South Mall of the campus since 1933, following a legal appeal to keep the controversial memorial in place was rejected.

In addition to the statue of the president of the Confederacy being removed, a statue of U.S. President Woodrow Wilson is also being moved to another location on the Austin campus.

Alaska is on the "bucket lists" for a lot of people, but for President Obama it's on his famous list of things that rhyme with bucket.

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, 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.

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."

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 longtime 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.

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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On a rare sunny morning in the northern Pacific Ocean, biologist Douglas Causey takes to the sea to conduct his research — binoculars in one hand, and a shotgun in the other.

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How Fishermen's Bragging Rights Gave Birth To Fine Art

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Fishing lore is full of tales about "the one that got away," and fishermen have been known to exaggerate the size of their catch. The bragging problem is apparently so bad, Texas even has a law on the books that makes lying about the size or provenance of a fish caught in a tournament an offense that could come with a felony charge.

About an hour's drive south of Kabul, there's a vast Buddhist archaeological site dating back at least 1,500 years. It happens to be sitting on top of one of the biggest untapped copper deposits in the world, potentially worth billions of dollars.

This is a story of American ingenuity and entrepreneurship. It is the story of the meat straw. Yes, you read that right.

"It is a straw made out of pork," explains Ben Hirko of Coralville, Iowa, the man behind Benny's Original Meat Straws.

It's a half-inch in diameter, the same length as a standard plastic straw. And it has a hole running down the middle of it, through which you're meant to slurp up Bloody Marys.

Are most people more likely to pull the trigger of a gun if the person they're shooting at is black?

A new meta-analysis set out to answer that question. Yara Mekawi of the University of Illinois and her co-author, Konrad Bresin, drew together findings from 42 different studies on trigger bias to examine whether race affects how likely a target is to be shot.

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