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STEVE INSKEEP, HOST:

President Trump skipped the annual Conservative Political Action Conference last year, but this year he was the annual gathering's hero who had finally returned the White House to Republicans.

London Bridge isn't falling down, but Britain's Parliament building — which sits along the River Thames and includes Big Ben — needs a ton of work. U.K. lawmakers are now analyzing a massive rehab plan that will cost billions of dollars and could force legislators to work somewhere else for years.

Among the rolling hills of ancient Africa, sometime around 8000 B.C., a dusty traveler was making gastronomic history, quite by accident.

Thirsty from a long, hot journey, the weary herdsman reached for the sheepskin bag of milk knotted to the back of his pack animal. But as he tilted his head to pour the warm liquid into his mouth, he was astonished to find that the sheep's milk had curdled. The rough terrain and constant joggling of the milk had transformed it into butter --- and bewilderingly, it tasted heavenly.

Readers asked: "When a humanitarian group has helped a community become self-sustaining, how can the group create a good 'exit strategy.'"

Our sources answered: Create the exit strategy from the get-go.

In the Wilmington neighborhood of Los Angeles, residential streets dead end at oil refineries. Diesel trucks crawl through, carrying containers from nearby ports. Longtime resident Magali Sanchez Hall says the pollution from all that has taken a toll, right on the street where she lives.

"The people that live here, the mother died of cancer," she says, pointing to a modest one-story home. "The people that live here, three people died of cancer."

Part 4 of the TED Radio Hour episode The Spirit Of Inquiry.

About Liz Coleman's TED Talk

Former Bennington College President Liz Coleman believes higher education is overly-specialized & complacent. She says we need to encourage students to ask bigger questions & take more risks.

About Liz Coleman

Part 3 of the TED Radio Hour episode The Spirit Of Inquiry.

About Kevin Jones' TED Talk

Sometimes, doctors just don't have the answers. Surgeon Kevin Jones says having the humility to acknowledge this leads to better medicine.

About Kevin Jones

Part 2 of the TED Radio Hour episode The Spirit Of Inquiry.

About Naomi Oreskes' TED Talk

In school, we're taught we should trust science because the scientific method leads to measurable results and hard facts. But Naomi Oreskes says the process of inquiry doesn't end there.

About Naomi Oreskes

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