Inventions: The Mother of Vacation-- Part 2: Cambridgeand Pittsburgh

CAMBRIDGE, MASSACHUSETTS: Home of the Massachusetts Institute of Technology.

Celebrities have been tinkering on stuff here for 150 years. You can tour the museum and campus. If I've heard MIT once, I've heard in a hundred times.

PITTSBURGH, PENNSYLVANIA: Much of America's industrial might once centered here Some of the country's most creative minds also operated here. But Foege also says that the Andy Warhol Museum is there: "He re-thought the whole notion of art. That in my mind is what tinkerers do."

--RoadDog