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Roman Mars

Design is everywhere in our lives, perhaps most importantly in the places where we've just stopped noticing. 99% Invisible is a weekly exploration of the process and power of design and architecture. From award winning producer Roman Mars. Learn more at 99percentinvisible.org.

99% Invisible

In the early 20th century, nothing quite fit — fire hoses couldn't connect to one another, football teams played with different balls, traffic lights meant different things in different states. Then World War II exposed the deadly cost of incompatibility, and the US quietly imposed a single solution on production lines across the world: the 60-degree screw. Roman Mars and historian Daniel Immerwahr tell the story of a hidden industrial empire, built one standard at a time.

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100 Objects #2: 60-Degree Screw

What started as a revolutionary treatment for river blindness became something far messier.

Listen to Drug Story wherever you get your podcasts!

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Drug Story: Ivermectin

In 1876, Americans filled an iron safe with objects meant to tell their story — to be opened a century later. Roman Mars and historian Jill Lepore trace its long wait, from Reconstruction to Watergate, and the surprising, unsettling contents that emerged in 1976. What do the objects we choose to preserve — or forget — reveal about how we author our own history?

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100 Objects #1: The Century Safe

As wild and random as they might seem, a lot of work—and even poetry—goes into coming up with today's catchiest, most unforgettable drug names.

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Ask Your Doctor About

America’s 250th birthday calls for a history as sprawling and contradictory as the country itself. 

A History of the United States in 100 Objects — hosted by Roman Mars and produced by BBC Studios and 99% Invisible — tells that history one thing at a time. A gold coin from an 1857 shipwreck that triggered a financial panic. An antebellum schoolbook that became an instrument of Black liberation. A ceramic dalmatian from the set of Wheel of Fortune. Or a tiny screw that shows how the US created a hidden industrial empire.

Each week, an object opens the door into an extraordinary, often shocking story — about who we’ve been, what we’ve built, and what we’ve allowed ourselves to forget. Some of these objects are well-known. Many are not. But all of them carry the story of how we got to this moment. This is not one narrative. It’s a hundred of them — forming a kaleidoscope that reveals a country stranger and more fascinating than any single telling could capture.

Launching May 19, 2026, wherever you listen to 99% Invisible.

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A History of the United States in 100 Objects Trailer

Why is it suddenly so hard to fix the stuff we depend on most?

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Enshittification

One man rejected nationality and dared the world to recognize him anyway.

Listen to Far From Home wherever you get your podcasts.

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Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

Citizen of the World

This is the ninth episode of our ongoing series breaking down the U.S. Constitution.

This month, Roman and Elizabeth discuss Article VI and VII, which include some odds and ends like the Debts Clause, the No Religious Test Clause, and the process for ratification. But tucked into Article VI is the all-important Supremacy Clause, which states that the Constitution is the “supreme Law of the Land,” and is probably the most frequently used constitutional law in practice.

Roman and Elizabeth are also joined by Dr. Alondra Nelson, a leading expert on AI. She discusses why AI is a challenge to regulate, what to think of the tug of war between the states and the federal government on the topic, and whether she’s optimistic governments will figure this out.

The 99% Invisible Breakdown of the Constitution

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Constitution Breakdown #9: Alondra Nelson

The world’s largest housing co-op—built to save New York City’s middle class—became the unlikely site of a resident revolt

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Co-op City

One study from 2018 found that Major League Baseball umpires blow about 14 calls every game. That’s 34,000 bad calls every year. And it makes a difference. A blown strike call can decide a win or a loss, a championship or six months at home, wondering what could have been. And while umpires are about 97% accurate in calling balls and strikes, Major League Baseball has been considering something drastic. Something to take us up to 100% accuracy. They have a plan to replace human umpires with robots. Now, with an update!

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Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

100 Objects #1: The Century Safe

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