The document discusses TeachMeets, which are informal gatherings where teachers give short presentations on projects, tools, ideas, or activities used in their classrooms. TeachMeets allow for collaborative professional development through sharing best practices. Presentations are typically 2 minutes for "nano" presentations, 7 minutes for "micro" presentations, or 15 minutes for "soapboxes." They aim to be low-barrier events that encourage just-in-time sharing of practical classroom experiences through brief presentations that don't require formal equipment beyond a projector.