All Things Considered

More trouble for the prosecution in the perjury trial of baseball star pitcher Roger Clemens. He is charged with lying to Congress when he said he had never used performance-enhancing drugs. But under cross examination, the key witness has himself admitted to lying and the key evidence has been called into question. NPR's Nina Totenberg explains all to weekends on All Things Considered host Guy Raz.

Sunday is the first day of the NATO summit in Chicago. Weekends on All Things Considered host Guy Raz talks with the U.S. Ambassador to NATO, Ivo Daalder about the Alliance's future, and with Vijay Prashad, a professor of international studies at Trinity College, who argues NATO is bad for the world. We also hear reports on the kickoff of the summit from NPR's Jacki Northam and on the protests from Cheryl Corley.

Chronic traumatic encephalopathy (CTE) is best-known for affecting football players; repeated bangs to the head can hurt the parts of the brain that direct impulse, memory and emotion. Now, scientists are finding evidence of CTE in the brains of veterans from Iraq and Afghanistan. Dr. Bob Stern from Boston University School of Medicine talks to weekends on All Things Considered host Guy Raz.

Adam Lambert captivated America in 2009 when he almost won American Idol. Lambert was brash, likable and glamorous, but he soon became better known for being the first openly gay Idol contender.

Though Lambert finished as the runner-up, his popularity and talent won him a recording deal. He released his second studio album, Trespassing, this week — just a few months after his 30th birthday.

Blind Chinese activist Chen Guangcheng and his family are due to arrive in Newark this evening after a surprise early-morning flight from Beijing. Host Guy Raz gets the latest from NPR's Michele Kelemen, who's been following the story.

John Mayer is one of the biggest-selling artists of the last decade — and with love interests like Jessica Simpson and Jennifer Aniston, one of its most pursued by the media. In 2010, he gave a pair of interviews to Rolling Stone and Playboy that shocked readers with sexually aggressive and racially insensitive language. Mayer seemed to be self-destructing in full view of his fans.

The blowback was intense, and Mayer pulled way back from the spotlight, rejecting almost every interview request. But this spring, he's started to come out of his shell to promote his first album since the controversy: a tender, introspective collection called Born and Raised.

German Baritone Dietrich Fischer-Dieskau has died — he was 86. Fischer-Dieskau began performing in the 1940s and had a career spanning five decades. He was perhaps best known for his interpretation of Franz Schubert's "Winterreise."

New Hampshire Episcopalians are set to choose a successor to retiring Bishop Gene Robinson, whose election in 2003 as the first openly gay Episcopal bishop created worldwide headlines and controversy between the church and the Anglican Communion.

Lisa Wangsness covers religion for the Boston Globe; she joins All Things Considered host Brady Carlson to look at the three candidates and the state of the Episcopal Church in New Hampshire.

Boston Globe: N.H. Episcopalians may elect 2d gay bishop

Bishop Search and Nomination Committee website

For decades, Muslims around the world have been unofficially boycotting Islam's third holiest site, the Al-Aqsa mosque Jerusalem.

Many Muslims believe that visiting legitimizes Israel's claim to the site, which also sits atop the holiest place in Judaism. The Palestinians, meanwhile, are seeking a state with a capital in east Jerusalem, where the mosque is located.

But Palestinian religious authorities at Al-Aqsa and Palestinian officials are now calling on Muslims to visit the shrine, a change that is creating controversy within the Palestinian community.

Last month one of Egypt's most important religious figures, Grand Mufti Ali Gomaa, came and prayed at the mosque.

Mark Zuckerberg is, among many other things, the highest-profile taxpayer on the planet today.

After today's Facebook IPO, Zuckerberg will owe nearly $200 million in California state taxes alone. That's "among the largest tax liabilities that a single individual has ever paid at a given point in time," says Jason Sisney of the California State Budget Legislative Analyst's Office.

Zuckerberg's profits will be taxed at a 10% rate in California. That's a much higher rate than in many other states.

In all, Facebook's employees and early investors are expected to pay about $2 billion in California state taxes over the next 13 months. But California is almost 16 billion dollars in the hole. Facebook won't solve that problem.

The flurry of activity continues at the New Hampshire statehouse.

Pop singer Donna Summer, whose long career began in the 1960s and reached its apex in the disco era of the '70s, died of cancer on Thursday at her home in Naples, Florida. Summer was 63 years old. According to Billboard magazine, the singer born LaDonna Gaines had 32 singles that charted in the Hot 100. Fourteen of them made it into the top 10. To hear Sami Yenigun's appreciation of Donna Summer's life and career, as heard on All Things Considered, click the audio link.