Today, the border that divides Northern Ireland and the Republic of Ireland is "soft", in most places you could almost forget that it's there. But for decades it was a deadly flash point in the bitter conflict known as "The Troubles" . This week, we share an episode from Today, Explained that takes a look at the history of this conflict and how Brexit could jeopardize a fragile peace.

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The Invisible Border

The past is never past. Every headline has a history. Join us every week as we go back in time to understand the present. These are stories you can feel and sounds you can see from the moments that shaped our world.

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Whether it's pesticides in your cereal or the door plug flying off your airplane, consumers today have plenty of reasons to feel like corporations might not have their best interests at heart. At a moment where we're seeing unprecedented product recalls, and when trust in the government is near historic lows, we're going to revisit a time when a generation of people felt empowered to demand accountability from both companies and elected leaders — and got results. Today on the show, the story of the U.S. consumer movement and its controversial leader: the once famous, now infamous Ralph Nader.

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Ralph Nader, Consumer Crusader

Of all the amendments to the U.S. Constitution, the 14th is a big one. It's shaped all of our lives, whether we realize it or not: Roe v. Wade, Brown v. Board of Education, Bush v. Gore, plus other Supreme Court cases that legalized same-sex marriage, interracial marriage, access to birth control — they've all been built on the back of the 14th. 

The amendment was ratified after the Civil War, and it's packed full of lofty phrases like due process, equal protection, and liberty. But what do those words really guarantee us?

Today on the show: how the 14th Amendment has remade America – and how America has remade the 14th.

Clarification: A previous version of this episode did not make clear that the 14th amendment guarantees equal protection and due process to all people in the United States, regardless of citizenship.

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The 14th Amendment

Tipping is a norm in the United States—and it's always been controversial. The practice took off after the Civil War, as employers sought cheap labor from formerly enslaved people: if tips were expected, companies could get away with paying laughably low wages. But the practice was always controversial, and has been vehemently challenged since it first came to the U.S. from Europe. We speak with Nina Martyris, a journalist who's written about the history of tipping in the United States, to find out how tipping—once deemed a "cancer in the breast of democracy"— went from being considered wholly un-American to becoming a deeply American custom.

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The Land of the Fee (Throwback)

Hezbollah is a Lebanese paramilitary organization and political party that's directly supported by the Islamic Republic of Iran. In the wake of the October 7, 2023 Hamas-led attack on Israel, and Israel's invasion of Gaza, Hezbollah and Israel have been exchanging missile fire across the border they share, causing growing fears of a regional conflict with the U.S. and Israel on one side and Iran along with its allies in Hezbollah, Hamas, and the Houthi rebels of Yemen on the other.

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A History of Hezbollah

What is school for? Over a hundred years ago, a man named Harold Rugg published a series of textbooks that encouraged students to confront the thorniest parts of U.S. history: to identify problems, and try and solve them. And it was just as controversial as the fights we're seeing today. In this episode: a media mogul, a textbook author, and a battle over what students should – or shouldn't – learn in school.

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The Invisible Border

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