We have expertise in modeling systems with a huge number of agents. This is useful in examining issues pertaining to traffic flow, ocean health, or the spread of diseases. For example, we have modeled 55,000,000 people in the United States moving via air travel. This allows us to determine where a virus will spread and to produce more effective vaccination strategies. The graph on the left illustrates that a vaccine has to have a certain effectiveness to stop the spread of a disease. The video on the right shows an example of our model running. The disease starts in Atlanta, Georgia. Then it quickly spreads to San Francisco. From there it eventually spreads to Denver and Las Vegas before continuing to other cities.