Almost every infrastructural challenge our cities face begins with the question of density. How many people are actually in the city? Where are they spending their time? Which trains are overcrowded? What about parks? Sidewalk traffic? San Francisco has one of the worst housing crises in history. Which of our buildings are being used at capacity? Without an answer to these questions it's impossible to effectively build. So how do we measure these things? I talked with Andrew Farah, CEO of Density, about the work his company has done in the space, and the now essential work they're doing to help our businesses and cities fight back against the pandemic.