Over the past six weeks, 13 students from Dartmouth College have been driving across the country in a former Greyhound bus, at various times sleeping on the ground, in tents or on benches in the bus.

But tonight, they’re sleeping in style at the Rio.

This isn’t just the story of a summer road trip. It’s a lesson in mechanics, architecture, engineering, politics, business, culture and the environment. Especially the environment.

And in Las Vegas, they have the attention of the largest casino operator in the world.

It’s called the Big Green Bus. ...

The students did most of the work themselves, including the mechanics and engineering.