"q&a," historian jeff gwinn discusses his book "the vagabonds," about the summer road trips with henryd and thomas edison. >> they wanted to go out and have fun. they wanted to demonstrate that you could get in your car and do they weregs, too, but not going to eat cold beans out of cans, put a blanket on the ground. they had all these different amenities. a refrigerated car powered by edison batteries, so they could chefsresh dairy, and preparing gourmet meals at night. in the morning, they would dress in freshly ironed clothes. but they were so famous, and america was so grateful to them, it didn't matter.t he point was, we are out in cars, traveling and seeing these things. you can do it, too. >> tonight at 8:00 eastern on c-span's