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National News from NPR

In this week's episode of the show and podcast Invisibilia, we explore what happens when you discover a part of yourself that is very different than who you think you are.

Federal regulators on Thursday said they've identified "the perpetrator of one of the largest ... illegal robocalling campaigns" they have ever investigated.

The Federal Communications Commission has proposed a $120 million fine for a Miami resident said to be single-handedly responsible for almost 97 million robocalls over just the last three months of 2016.

Officials say Adrian Abramovich auto-dialed hundreds of millions of phone calls to landlines and cellphones in the U.S. and Canada and at one point even overwhelmed an emergency hospital paging service.

Women in their 40s at average risk for breast cancer should talk to their health care provider about the risks and benefits of mammography before starting regular screening at that age, according to guidelines released Thursday by the American College of Obstetricians and Gynecologists.

For the first time in more than four decades, the Yellowstone grizzly bear is set to lose its federal protections under the Endangered Species Act. Citing a rebound in the bear's population, the U.S. Department of Interior announced its intention Thursday to end these protections and return oversight of the animal's status to the state level.

The agency says the rule to remove the grizzly from the endangered species list will be published "in coming days" and "will take effect 30 days after publication."

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Tim Mueller has raised corn and soybeans on 530 acres near Columbus, Neb., for decades, but now he is planning to take a huge gamble.

The big-box retailer Costco is building a new chicken-processing plant in Fremont, Neb., about an hour away from Mueller's farm. The company plans to slaughter 2 million birds per week. To raise all those chickens, Costco is recruiting about 120 farmers to sign on as contract poultry farmers.

Mueller wants in. But to do that, he plans to take out a massive $2 million loan to finance the construction of four chicken barns.

Republicans in the Senate on Thursday unveiled their plan to repeal and replace the Affordable Care Act — also known as Obamacare. The long-awaited plan marks a big step towards achieving one of the Republican party's major goals.

Updated at 4:15 p.m. ET

Senate Republicans' health care bill may already be on life support, with four key lawmakers announcing their opposition just hours after the GOP's latest effort to repeal and replace the Affordable Care Act was released.

"Currently, for a variety of reasons, we are not ready to vote for this bill, but we are open to negotiation and obtaining more information before it is brought to the floor," Sens. Rand Paul, R-Ky.; Ted Cruz, R-Texas; Mike Lee, R-Utah; and Ron Johnson, R-Wis., said in a statement Thursday afternoon.

A sniper with Canada's elite special forces is being credited with making a world record shot, after the military confirmed Thursday that he hit a target from nearly 2.2 miles away during a recent operation in Iraq.

Military sources tell Canada's The Globe and Mail newspaper that the sniper killed an ISIS insurgent during an attack on Iraqi security forces.

One of nature's most efficient life-support systems is the egg. Eggs evolved over 300 million years ago as vertebrate animals adapted to living on land. And since then, they've taken on numerous shapes, especially among birds.

Biologists have long wondered why there are so many shapes, and what determines each one. Hummingbirds, for example, have eggs like Tic Tacs. Birds called murres produce eggs shaped like big teardrops. Some eggs are more like pingpong balls.

Now, an international team of scientists believes it has solved the mystery of the eggs.

A North Carolina man who fired an AR-15 rifle inside a pizza restaurant in Washington, D.C., last year as he was "investigating" a baseless conspiracy theory has been sentenced to four years in prison.

Edgar Maddison Welch pleaded guilty in March to federal charges of assault with a dangerous weapon and transporting a firearm over state lines. The case is seen as a clear example of the potential real-world consequences of fake news stories.

Updated at 1:59 p.m. ET

President Trump gave a straight answer on Thursday about whether he has recordings of his private conversations with fired FBI Director James Comey — No.

The question of the existence of tapes arose on May 12, when shortly after firing Comey, Trump tweeted that the former FBI director "better hope that there are no 'tapes' of our conversations."

In May 2015, then-President Barack Obama signed into law legislation that created a new kind of public emergency notification — the Blue Alert.

It's similar to the well-known Amber Alert for abducted children, but is meant to help catch people who credibly threaten or actually harm law enforcement officials.

A naturalized U.S. citizen should not have been stripped of her citizenship for the sole reason that she lied to U.S. officials, the Supreme Court ruled Thursday, vacating a lower court's decision. The plaintiff, an ethnic Serb who entered the U.S. as a refugee, had argued that false answers she gave to immigration officials were immaterial to procuring citizenship.

"We have never read a statute to strip citizenship from someone who met the legal criteria for acquiring it," Justice Elena Kagan wrote in the court's opinion. "We will not start now."

Mass shootings in Orlando, Fla., Alexandria, Va., and San Francisco during the first two weeks of June — two of them on the same day — have once again put America's complicate

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