As adults battle over how climate change should be taught in school, we try an experiment. We ask Dr Roberta Johnson, the Executive Director of the National Earth Science Teachers Association, who helps develop curricula on climate change, to present the best evidence there is to a high school skeptic, a freshman named Erin Gustafson.

Ira speaks with Middle East specialist Michelle Dunne to answer this question: Before the recent Arab uprisings, just how hard was the US pushing the government of Egypt to enact human rights reforms? (7 1/2 minutes)

Ira Glass speaks with several members of the Planet Money team, who all found themselves—in the course of their reporting—independently asking the same stoner-ish question: What is money? Ira and Planet Money producer Jacob Goldstein discuss a pre-industrial society on the island of Yap that used giant stones as currency. The book that Jacob read about Yap is called The Island of Stone Money.

Reporter Laura Beil tells the story of a kid named Kenneth Williams and an adult named Ton'Nea Williams (who share a last name but are not related).

Host Ira Glass tells the stories of two professors, each making a calculation that no one had made before. One gets acclaim.

Joshuah Bearman's story continues. Chris Butler makes a transition into true criminal behavior.

Jake Halpern tells this story about document expert John Reznikoff, who came into possession of some materials which—if authentic—would change history. Then things got complicated.

The number of wild turkeys in the United States has risen from 30,000 at thebeginning of the 20th century to an estimated seven million today. And it'scommon for them to get aggressive with people.

Nubar Alexanian was forced to give up one thing—and then gave up another thing by choice. This story was put together by Nubar and his daughter Abby, with help from Jay Allison, for Transom.org, with funding from the Corporation for Public Broadcasting.

In the 1970s, Dave Kestenbaum's cousin Dan Weiss got promoted from stocker to gift shop manager at the Kennedy Center for the Performing Arts in Washington DC. It was a good job... except for the fact that the place was bleeding cash because of apparent embezzlement.

There's a part of Brazil that was almost all rainforest until the 1970s, and over the next few decades a million people moved in, cutting down the forest and building towns and cities. Monte Reel was the South American correspondent for the Washington Post in the mid 1990s, when he started hearing rumors of a "wild man," the last member of a tribe, who lived completely alone in this area's remaining forest. Reel's book about the quest to find and save this man is called The Last of the Tribe.

Joshuah Bearman tells the story of Pete's ridealong with the PI Moms, and how strange things started to happen. As he dug deeper into their operations, he learned about cases like the Candyman, where everything gets oddly and unnecessarily complicated.

Ira Glass explains that, like the rest of America, we at This American Life are not tired of those stories of women who have no idea they're pregnant and then—poof—one day a baby pops out. Ira and several of our producers speak with Jennifer Lyne, who found out just a few days before giving birth and even appeared on the TV show I Didn't Know I Was Pregnant.

Ira explains that when the radio staff decided to take a test that reveals who is a psychopath, very quickly everyone came to believe that the highest score would go to either Robyn, Jane, or him.

Chicago writer Rebecca Makkai bring us the story of a reality television producer attempting to gossip love into existence—and just how complicated that gets. This fiction story originally appeared in the journal Crazyhorse.

We sent a reporter named Dan Grech to the Hundred Year Starship Public Symposium, which aims to tackle the technological problems related to interstellar space travel. And as host Ira Glass explains, Dan found this gathering to be way more adventurous than your average scientific conference.

In 2008, reporter Chris Neary told the story of John, a soldier who returned from tours of Iraq and Afghanistan with severe PTSD, and ended up attacking his fiancee and her mother. Chris finds out how John is coping today.

Laura and Alex continue their story about Intellectual Ventures and the practice of patent trolling. They learn why the buying and selling of patents is likely to continue being a huge, controversial business that affects the entire tech industry.

Thursday night was a make-or-break evening for candidate Herman Cain at the first Republican Presidential debate. Robert Smith from our Planet Money team talked to him about his strategy.