99% Invisible

In the early 1950s, teenage students in Lake County, Indiana, got up from their desks, marched down the halls and lined up at stations. There, fingers were pricked, blood was tested and the teenagers were sent on to the library, where they waited to get a specialized tattoo. Each one was in the same place on the torso, just under the left arm, and spelled out the blood type of the student. This experimental program was called Operation Tat-Type. It was administered by the county and the idea was simple: to make it easier to transfuse blood after an atomic bomb. At the age of 16, producer Liza Yeager's grandmother, who went to school in Lake County, was permanently marked in anticipation of a nuclear catastrophe.

99% Invisible is starting the year off with the sixth installment of our staff mini-stories. Kicking off 2019 are a set of tales about a perpetual lie about New York City, karaoke, a 50-foot-tall burning puppet, the result of a Canada-U.S. border dispute, and time thieves.

Magic: The Gathering is a card game and your goal is to knock your opponent down to zero points. But Magic: The Gathering also has a deep mythology about an infinite number of parallel worlds. Eric Molinsky of looks at why this handheld card game has survived the onslaught of competition from digital games, and how the designers at Wizards of the Coast create a sense of story and world-building within a non-sequential card game. Subscribe to Imaginary Worlds on

For the holidays this year, we're presenting a two-part Radiotopia feature with friend of the show (and host of podcast) Helen Zaltzman, each tackling a different aspect of this festive season. Subscribe to The Allusionist on

It’s the end of 2018 and time for our annual Mini-stories episodes. These are my favorite episodes of the year to make. Mini-stories are fun, quick hit stories that don’t quite warrant a full episode and two months of hard reporting, but they’re great 99pi stories nonetheless. This week we have stories of 60s cult TV shows, semi-useless gadgets, woo woo miracles cures, and a modern Christmas tradition.