Every day this week we’re following StartupBus, a hackathon on wheels, where a bunch of strangers come together to launch companies in one week, all while on a bus. If you haven’t heard Monday’s episode, start there.

It’s Wednesday, day three on StartupBus. Teams have just 24 hours left to refine their pitches before the competition begins. And reporter Eric Mennel sits down with some of the bus riders to learn more about why they signed up for this unusual hackathon in the first place.