Explore the groundbreaking Human Cell Atlas project in this 50-minute Aspen Lecture. Delve into the ambitious effort to create a comprehensive, searchable map of human cells, akin to a "Google map for the human body." Learn about the project's potential to revolutionize personalized medicine by cataloging cellular subtypes, gene expression profiles, and environmental influences. Discover how this atlas is being applied to various test cases, including airway studies, zebrafish development, and human blood formation. Gain insights into the project's impact on cancer immunotherapies and inflammatory bowel disease research. Understand the mission, principles, and international scope of the Human Cell Atlas initiative, including its large-scale funding and phased approach to data collection and platform development.