 Hi, this is Don Schenck with Red Hat Developer, and this is the vaccine system sandbox activity. Events are generated and sent to Kafka. From there, a Kubernetes job will read the events and store them in a Martin event store. A roll-up microservice takes a date and summarizes all the vaccinations for that date and stores them in a MariaDB database. Another microservice will read from that database and return a JSON array to a web front end. Let's take a quick look. Here's the web front end, and here's the create vaccinations. If I click on create vaccinations and pick a date, let's say October 31st, and generate data, it'll generate a random number of events for that date. Now that that's done, I can roll them up. That is, it will summarize all the events from the 31st of August into one row in a database. And finally, I can look at a trends graph that shows me my summaries by date. There's other data in here because I've been running this. You can go ahead and get this activity started by heading over to developers.redhat.com, getting your own sandbox, and trying this out. Thank you.