The Known Unknown

What the world's most advanced traffic system can—and can't—do for the city that invented gridlock. What infrastructure mystery keeps you up at night? Submit your Service Request by recording a voice memo with your question and emailing it to servicerequest@99pi.org. Service Requ ...  Show more

The surprising power of a simple phone number to connect a community. What infrastructure mystery keeps you up at night? Submit your Service Request by recording a voice memo with your question and emailing it to servicerequest@99pi.org. Service Request is a production of 99% Inv ...  Show more

A tomb revisited. In 1923 CE, excavations at Luxor revealed the graves of ancient Egyptian soldiers. They bore scars of battle on their bones and flesh; and their story may belong to one of several major conflicts within the Nile Valley, around 2000—1900 BCE. In this episode, we ...  Show more

THE GRAVE AND MEMORIAL BENCHES: Laurie Taylor talks to Allison C. Meier, New York based researcher, about how burial sites have transformed over time. Whilst the grave may be a final destination, it is not the great leveller, and permanency is always a privilege with the indigent ...  Show more

In his lifetime King Alexander III of Macedon, better known as Alexander the Great, forged one of the largest empires in ancient history. But it was what happened to Alexander following his demise – his ‘life after death’ - which resulted in one of the great archaeological mys ...

Acadia National Park may exist on an island but in the late 1970's a human predator showed up there and started hunting. The identity of the killer has remained unknown for more than four decades and the mystery as to who killed Leslie Spellman is still waiting to be uncovered ...