9. The metric system
Yep, the system is so good that all but three countries on the planet have officially adopted it. Myanmar, Liberia, and um, one other...
10. The world's understanding of American democracy
You would think that they could have figured this out on their own, but sometimes it takes an outsider to explain what they can't see internally. That’s exactly what Paris-born Alexis de Tocqueville did in Democracy in America, a book that would be one of the most influential political works of the 19th century, and that you probably had to read excerpts of in college. A Harvard professor calls it "At once the best book ever written on democracy and the best book ever written on America."