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KELLY MCEVERS, HOST:

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AUDIE CORNISH, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

KELLY MCEVERS, HOST:

Senate Republicans 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 toward achieving one of the Republican Party's major goals.

Updated at 6 p.m. ET June 23

Nevada Sen. Dean Heller on Friday became the latest GOP lawmaker to voice concerns about the Senate health care bill — a development that further complicates Republican efforts to repeal and replace the Affordable Care Act.

"I cannot support a piece of legislation that takes away insurance from tens of millions of Americans and hundreds of thousands of Nevadans," Heller said at a news conference back in Nevada.

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.

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."

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.

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.

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.

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