Watch a skate video today, and you'll notice how similarly shaped the boards are. It’s called the “popsicle” design, because the deck is narrow in the middle and rounded off at both ends, like a popsicle stick. This may seem stupid simple, but that basic, clean popsicle shape is actually the product of a lot of experimentation and iteration. In 1989, one particular board would cement skateboard design as we know it. But to understand it, we have to go back over a decade to the mid-70s, as more and more money poured into the growing sport.The Double Kick 

Welcome to our first official episode, breaking down the 1974 Pulitzer Prize winning book, The Power Broker by our hero Robert Caro. Robert Caro happens to be our special guest for this episode and you do not get more special than that.On today’s show, Elliott Kalan and Roman Mars will cover the Introduction, Part 1, and Part 2 of the book (the intro through the end of Chapter 5), discussing the major story beats and themes, and then we will bring the great Robert Caro to the stage. Power Broker #1: Robert CaroJoin the discussion on Discord and our Subreddit

Fake cities. Imitation nations. People role-playing as civilians, spies, or enemies, complete with costumes and props. It's all part of an effort coordinated and constructed by the U.S. military to prepare soldiers for war. Fake villages designed for training purposes dot the entire United States, not to mention other countries. Researchers have identified over 400 of them around the world.Imitation Nation

Our second and final set of mini-stories for the season: We'll be covering upside-down construction, the linguistics of filler and a fire that has been burning for decades.Check out Lizzie No's latest album Halfsies on Band Camp.  She's on tour in 2024. Go see her and say hi for me!Mini-Stories 18

We're revisiting this Christmas classic from 2021. Happy Holidays!Slovenia is a small country in Central Europe nestled between Italy, Austria, Croatia and Hungary. It's a land of snowy white peaks, green valleys, and turquoise rivers. The country is beautiful in all seasons, but it is perhaps at its most magical around Christmastime. This nation of just over 2 million people is visited by, not one, not two, but three different "santas" every festive season. But it hasn't always been this way. Each Santa has had his moment in the spotlight—each in a different period of Slovenia’s complicated history. And in order to have a Christmas season that reflects that history and speaks to all Slovenians, you need three magical men.The Three Santas of Slovenia

It's the most wonderful time of the year. It's mini-stories season! Gather the kids around the fire because We have a year-end mix of short stories about a rogue architect, spooky kitchens, a hundred year old music streaming service, and the crazy way the French tried to make telling time less crazy.Today's episode featured a story from Sound Detectives. Listen to Sound Detectives on Apple Podcasts, Spotify, or wherever you listen to podcasts, and go to sounddetectivespodcast.com to find coloring pages, sound terms, and more.Mini-Stories: Volume 17

Keeping track of numbers has always been part of what makes us human. So at some point along the way, we created a tool to help us keep count, and then we gave that tool a name. We called it: a calculator. But depending on what era you were born in, and maybe even what country, what constituted a 'calculator' varied widely.Keith Houston wrote about the evolution of the calculator in his latest book, Empire of the Sum The Rise and Reign of the Pocket Calculator. It is exactly the kind of nerdery we like to get up to here at 99% Invisible -- history explained through the lens of an everyday designed object.Empire of the Sum

Today's episode features #1 Robert Caro superfan, Conan O'Brien.The Power Broker by Robert Caro is a biography of Robert Moses, who is said to have built more structures and moved more earth than anyone in human history. And he did it without ever holding elected office. Outside of New York City, Robert Moses wasn't exceptionally well known. Inside of New York, he was mostly accepted by the media as simply the man who built all those nice parks. But The Power Broker, which is subtitled Robert Moses and The Fall of New York, changed all that. It is a tour de force of journalism, history, and biography. Roman also argues it's really fun to read and is strongly in contention for the best book ever written.But there is something of a catch, which can hang readers up: the book is a daunting 1200 pages long. As influential and amazing as this bestseller is, many people own an unopened copy gathering dust on their bookshelf. But that is a crime because this book needs to be read or at least discussed at length on a podcast.Roman Mars and Elliott Kalan (Flop House, Daily Show) are starting The Power Broker book club that will run through all of 2024 as bonus episodes and in this introductory episode, Conan O'Brien joins us to talk all things Robert Caro.Breaking Down The Power Broker

Roman note: This is one of my favorite episodes of all time. Should be a movie. Enjoy!The tradition of the Tomb of the Unknowns goes back only about a century, but it has become one of the most solemn and reverential monuments. When President Reagan added the remains of an unknown serviceman who died in combat in Vietnam to the Tomb of the Unknowns in Arlington National Cemetery in 1984, it was the only set of remains that couldn’t be identified from the war. Now, thankfully, there will never likely be a soldier who dies in battle whose body can’t be identified. And as a result of DNA technology, even the unknowns currently interred in the tomb can be positively identified.The Known Unknown

The Cassette tape was great in so many ways, but let’s be honest, they never really sounded great.  But because the cassette was so much cheaper and easier to use and portable, a lot of people didn't care so much about the audio quality. They just wanted to be able to use something that they could carry around with them. The cassette’s other big advantage: it was easy to record on.We talked to Marc Masters about his new book High Bias, about the history of the cassette. One chapter about concert bootleggers covers perhaps the greatest success story of the cassette: Grateful Dead live tapes.Long Strange TapePlus we're featuring a bonus story that we produced in 2016 in collaboration with Benjamen Walker's Theory of Everything about a place where cassettes were of vital importance.