Dave Troy speaking at the TED University session of TEDGlobal 2014. Photo: Ryan Lash/TED

Today was the first day of TEDGlobal 2014. If you weren’t able to clear your schedule to watch TED Live today and experience the magic in real-time, we’re here to help. Here are some highlights from the day:

What maps can tell you about hip-hop fans

At TED University, a session of talks by conference attendees, Dave Troy maps the social media use in his hometown of Baltimore, Maryland, to reveal some surprising micro-communities within the city. He shows how hobbies can overlap across demographics — geeks and hip-hop fans, who are largely separate on his map, overlap to talk about the Baltimore Orioles. As he says: “Segregation is a social construct. It’s something we choose to do, and we can choose not to do it.” [See the recap.]

Nerding out on a boiling river

As a child…