A record number of Americans have died from opioid overdoses in recent years. But how did we get here? And is this the first time Americans have faced this crisis? The short answer: no. Three stories of opioids that have plagued Americans for more than 150 years.

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Today, electricity in the U.S. is a utility we notice only when it's suddenly unavailable. But over a hundred years ago, electricity in the homes of every American was a wild idea and the subject of a bitter fight over who would power, and profit from, the national grid. This week, the battle that electrified our world and the extreme measures that were taken to get there.

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This week we're revisiting one of our favorite episodes about one of our favorite topics: Conspiracy theories. They're a feature of today's news and politics. But they've really been a part of American life since its founding. In this episode, we'll explore how conspiracy theories helped to create the U.S. and how they became the currency of political opportunists.

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As extreme weather wreaks havoc around the globe we look at a natural disaster more than 200 hundred years ago that had far-reaching effects. This week, how the eruption of the Icelandic volcano Laki awed, terrified and disrupted millions around the world and changed the course of history.

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On November 20th, 1979, a group of Islamic militants seized Islam's holiest site — the Masjid al-Haram in Mecca, Saudi Arabia. They took thousands of hostages and held the holy site for two weeks, shocking the Islamic world. This week, how one man led an uprising that would have repercussions around the world and inspire the future of Islamic extremism.

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NPR science correspondent Geoff Brumfiel shares the story of Nazi Germany's attempt to build a nuclear reactor — and how evidence of that effort was almost lost to history. It's a tale he heard from Timothy Koeth and Miriam Hiebert at the Department of Materials Science and Engineering at the University of Maryland in College Park.

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Over the decades the Kurds have been inspired by, allied with, relied upon and betrayed by the United States. This week we explore who the Kurds are, who they are to the United States and what, if anything, we owe to them.

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Zombies have become a global phenomenon — there have been at least ten zombie movies so far this year. Which made us wonder, where did this fascination for the undead come from? This week, how one of our favorite monsters is a window into Haiti's history and the horrors of slavery.

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50 years ago the world watched as man first landed on the moon, an incredible accomplishment by the engineers and scientists of NASA. But what if some of those same engineers and scientists had a secret history that the U.S. government tried to hide? This week, the story of how the U.S. space program was made possible by former Nazis.

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Over the past six months, demonstrations in Hong Kong have increasingly become more violent and more determined. What started out as a protest against a proposed extradition law has now become a call for China to recognize Hong Kong's semi-autonomy. But what is at the root of this tumultuous relationship between Hong Kong and China? This week, how Hong Kong became one of the most important, and most contested, cities in the world.

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