In order to see the red of a sunset or the green of spring leaves, developing human eyes need to get the right hormone at the right time.

That's the finding of a team of scientists who studied how color vision develops using hundreds of human retinas grown in the lab.

Indonesia is winding down its search and rescue operations, with thousands of people believed to be still missing after a devastating earthquake and tsunami struck last month on the island of Sulawesi.

The official death toll for the disasters stands at 2,073. But the national disaster agency says that the number of those still missing could be as high as 5,000, after the strength of the quake caused the ground to liquefy and swallow up buildings and people.

Search efforts had been set to end Thursday, but were extended to Friday.

Kevin P. Gallagher (@KevinPGallagher) is the director of the Global Development Policy Center at Boston University's Pardee School for Global Studies.

China has become the world's largest development bank.

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After the huge sell-off Wednesday, U.S. stocks fell sharply again Thursday. At one point, the Dow was down nearly 700 points. By late afternoon, it had regained some ground but closed down 546 points or a little more than 2 percent.

Over the past two days, the Dow has lost 1,378 points. The S&P 500 was down 2 percent for the day. The Nasdaq lost 1.25 percent.

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News and Features from APM and PRI

How food banks are reaching high-risk seniors

3 hours ago

The AARP estimates more than 10 million people 50 and older are at risk of going hungry every day in the United States. In Florida, where many baby boomers retire, this food insecurity is compounded by a lack of public transportation. Some food banks are holding food drops to bring food and other health-related events to the neighborhoods where they live in an attempt to reach more high-risk seniors.

This story was produced by the Marketplace hub at WMFE in Orlando.

Questlove on "chasing ghosts"

6 hours ago

If you watch late night TV — "The Tonight Show Starring Jimmy Fallon," in particular — you probably know the show’s house band, The Roots. And perhaps you'd recognize its drummer and frontman, Questlove, aka Ahmir Khalib Thompson.

Thompson is also a DJ, a producer, an author, a foodie, and a podcaster on Pandora with "Questlove Supreme." He came into the studio Thursday to talk with Marketplace host Kai Ryssdal. The following is an edited transcript of their conversation.

Why do gas prices end in 9/10 of a cent?

6 hours ago

This series originally ran during February 2014. We're republishing it today in light of our Make Me Smart podcast's new Explainathon episode, which included the first question here. The rest are good too, and the original article appears below.

For those of you who have stockpiles of Forever Stamps, some good news: the post office is planning to hike their prices.

The U.S. Postal Service has proposed increasing the price of its first-class mail Forever Stamp from 50 cents to 55 cents, which would take effect on Jan. 27 of next year. (However, the price for any additional ounces will drop from 21 cents to 15 cents.) Like the name suggests, this piece of postage doesn't expire.

If you’re among those who feel press coverage of Russia has an unhealthy fascination with all things Vladimir Putin, then enter artist Victoria Lomasko’s “Other Russias” to the rescue. 

That plural is no accident. Lomasko is out to capture Russian stories that most in the West never see.

“It was important to me over the last years to make a portrait of the unofficial face of the country,” Lomasko tells The World. “That part that we almost never hear from in the media.”  

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