Months ago, someone contacted us with an astounding dataset. It tracked the precise movements of more than 12 million Americans in several major cities including Washington, New York and San Francisco. Today we published our findings:

Months ago, someone contacted us with an astounding dataset. It tracked the precise movements of more than 12 million Americans in several major cities including Washington, New York and San Francisco. Today we published our findings: https://t.co/U6hVTTI9WU

— Stuart A. Thompson (@stuartathompson) December 19, 2019