Tickets to the tournament

While returning to school, Ellen receives a message from her Media Agent telling her about an upcoming tournament in town. It asks her if she plans to attend. She talks about it with her friends and decides to go. When she confirms, the server looks for a way to connect the topic of the event-tennis-with any of Ellen's other interests listed in her profile. She only has one other interest indicated-trigonometry-but nothing in the database connects the two topics. So it sends a challenge to Cavalry experts whose profiles list both sports and trigonometry. One member accepts the challenge and does a little research, writes up a short text, annotates it with an image, and sends it back to the server, where it waits in a queue for a scheduled delivery.

While watching the tournament a week later, Ellen receives the message on her phone. It shows her how the arc of the tennis ball can be described mathematically with trigonometry. It even shows her a small graphic to illustrate the idea. Ellen looks up from the phone to see the tennis game in a new light.

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