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 <a href="http://99percentinvisible.org">99percentinvisible.org</a>.<br/> A proud member of Radiotopia, from PRX. Learn more at <a href="http://radiotopia.fm/">radiotopia.fm</a>.
July 19th, 2016
Episode 235 of 263 episodes
In 1943, the Army Corps of Engineers began construction on a scale model that could test flooding in all 1.25 million square miles of the Mississippi River. It would be a three-dimensional map of nearly half of the continental United States, rendered to a 1/2000 horizontal scale, spanning more than 200 acres. It was so big that the only way to see all of it as once was from a four-story observation tower. Ryan Kailath paid it a visit. America's Last Top Model Snag one of the last 99pi Challenge Coins!