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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.

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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

Updated at 2:32 p.m. ET

Senate Republicans unveiled their long-awaited health care overhaul proposal on Thursday. The Senate bill, called the "Better Care Reconciliation Act," would repeal major parts of the Affordable Care Act, also known as Obamacare. The broad outlines of it look a lot like the House bill, the American Health Care Act, which was passed in May.

Thanks to Sigmund Freud, we all know what it means to dream about swords, sticks and umbrellas. Or maybe we don't.

"For 100 years, we got stuck into that Freudian perspective on dreams, which turned out to be not scientifically very accurate," says Robert Stickgold, a sleep researcher and associate professor of psychiatry at Harvard Medical School. "So it's only been in the last 15 to 20 years that we've really started making progress."

If you're standing in the blazing sun struggling to read this on your cellphone, there may be some relief in sight.

And you'll have a moth to thank.

The reason you have to find shade to read your phone is the way the light reflects off the screen. The reflection reduces contrast, washing out images.

When faced with allegations of sex abuse against one of its bishops, the Church of England "colluded and concealed rather than seeking to help those who were brave enough to come forward," the church's leader acknowledged Thursday.

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One of China's most controversial celebrations, the annual dog meat festival in southwest China's Yulin City, is underway.

The event inflames passions among the celebrants and their critics to such a degree that the local government seems to be in a bind, unable to placate either side. Activists say that this year, the government issued a ban on the sale of dog meat, only to reverse following an outcry from locals.

"It's really confusing," says Zhang Xiaohai, secretary general of the AITA Foundation for Animal Protection in Beijing.

The humanitarian aid system is broken.

That's the message of a new paper by Paul Spiegel, a former senior official at the U.N. High Commissioner for Refugees (UNHCR). The piece was part of a special series on health and humanitarian crises published by the British medical journal The Lancet in early June.

America's diversity remains on the rise, with all racial and ethnic minorities growing faster than whites from 2015 to 2016, the U.S. Census Bureau says in a new snapshot of the national population. The agency also found the U.S. median age has risen to nearly 38.

Asian and mixed-race people are the two fastest-growing segments of the U.S. population, the U.S. Census Bureau says. Both groups grew by 3 percent from July 2015 to July 2016. In the same 12 months, the non-Hispanic white population grew by just 5,000 people.

Mozart And 'The Peanut Vendor' In Havana

Jun 22, 2017

Last month, American pianist Simone Dinnerstein was in Cuba preparing for her current North American tour with an orchestra of young musicians from Havana. She fondly recalls one very hot rehearsal.

Louisiana has become the first state to prohibit all public universities from asking applicants about their criminal history.

By some estimates, as many as 70 to 100 million Americans have some kind of criminal record.

Immigration authorities have rounded up nearly 200 Iraqis in recent weeks, and the Trump administration is now under heavy pressure to hold off moves to deport them.

Many of those currently detained are from the minority Chaldean Christian community, which faces severe persecution in Iraq.

U.S. immigration authorities say the detained Iraqis have criminal records, but their families and supporters say many have already served time or paid their fines and that they would face persecution if sent back.

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And NPR's Alison Kodjak, who covers health policy issues and is covering this bill, has been listening in with us. And she's on the line. Alison, what did you hear that was significant there?

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One of the biggest threats to global agriculture these days is a tiny, bright red weevil.

These little crimson devils eviscerate coconut, date and oil palms, and are native to South Asia. But thanks to globalization, and the fact that these tenacious buggers can fly up to 30 miles a day — over the last three decades they've spread to more than 60 countries from the Caribbean to Southern Europe.

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Some coastal areas in Texas and Louisiana are under a tropical storm warning and forecasters are warning of potential heavy flooding as Tropical Storm Cindy moved inland from the Gulf of Mexico Thursday morning.

Severe weather and flooding have already been reported over the past two days along the Gulf Coast. The storm made landfall early Thursday morning near the Texas/Louisiana border, according to the National Hurricane Center.

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Good morning. I'm David Greene. In Gotham City, two words are a criminal's nightmare.

(SOUNDBITE OF FILM, "THE LEGO MOVIE")

WILL ARNETT: (As Batman) I'm Batman.

For the hundreds of rural U.S. hospitals struggling to stay in business, health policy decisions made in Washington, D.C., this summer could make survival a lot tougher.

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