Weekend Edition Sunday

In Jiaonan county, the Qi wall incorporates outcrops of bedrock. Linda Nicholas/The Field Museum hide caption

itoggle caption Linda Nicholas/The Field Museum

Science

Centuries Before China's 'Great Wall,' There Was Another

Archaeologists are now mapping a wall in eastern China that is as much as 15 feet tall in some places, and predates the more famous barrier by 300 years. Hundreds of miles long, it was likely erected to keep neighboring Chinese dynasties from invading each other, historians say.

Tom Brakefield/Getty Images

Animals

To Save The Black Rhino, Hunting Club Bids On Killing One

Fewer than 5,000 black rhinos are thought to exist in the wild, but the Dallas Safari Club is auctioning off a permit to hunt one down. It says the controversial fundraiser is a conservation effort.

In Virginia this summer, Arlington Public Schools transported students in poor neighborhoods to community libraries for group readings. Studies say children from low-income families may hear roughly 30 million fewer words by age 3 than their more affluent peers. Bill O'Leary/The Washington Post/Getty Images hide caption

itoggle caption Bill O'Leary/The Washington Post/Getty Images

Education

Closing The 'Word Gap' Between Rich And Poor

Children in low-income families hear dramatically fewer words, which often sets them back in school and later life. The gap was officially documented in the 1990s, but has persisted. Now an entire city is trying to close the divide.

Somewhere Bill Frisell 0:09

People are Strange Damià Timoner 1:01

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We Could Forever Bonobo 0:17

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In Virginia this summer, Arlington Public Schools transported students in poor neighborhoods to community libraries for group readings. Studies say children from low-income families may hear roughly 30 million fewer words by age 3 than their more affluent peers. Bill O'Leary/The Washington Post/Getty Images hide caption

itoggle caption Bill O'Leary/The Washington Post/Getty Images

Hello Goodbye Stephen Bennett

Say That to Say This Troy "Trombone Shorty" Andrews & Trombone Shorty 0:38

Theme from Midnight Express Giorgio Moroder 0:06

Flashdance... What a Feeling London Ensemble 1:26

Weekend Edition Sunday