639. You can't fold paper more than seven times.
Um...yes, you can. It's called origami. Unless you're talking about a specific kind of paper, like paper money, but that you can fold something like 1,000 times before it tears. (That is, the Canadian and American bills.)
640. The names of the continents end with the same letters as the first.
And what about North America and South America? They are considered separate continents, you know.