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This week on SciStarter LIVE! we're demo-ing the project that had the most contributors and the most contributions on SciStarter in 2022: Stall Catchers! Researchers have found that reduced blood flow in the brain — a symptom of Alzheimer's — is caused by clogged vessels called stalls. In Stall Catchers, players watch videos from brain scans of mice and categorize vessels as flowing or stalled. We'll be joined by Stall Catchers' founder, Pietro Michelucci, the director of the Human Computation Institute, to answer your questions and hear more about how Stall Catchers advances Alzheimer's research. Whether you're a long-time Catcher or just getting started, you won't want to miss this event. SciStarter LIVE! is a weekly event where you can join us on Zoom or watch the live stream on SciStarter’s Facebook page as we work through a citizen science project together. We’ll demonstrate the project and answer your questions. If you register, we will email you a link to the recording. Before the event, be sure to sign up for a SciStarter account at if you haven’t already.