nothing beats wright's 'explanation' of unsigned int:

Gunning asks if Wright knows what “unsigned” means in the variable declaration, and presses him to explain. Wright says yes, basically it’s an integer with… it’s larger… I’m not sure how to say it. I’m not sure how to describe it. I know what it is. Gunning pulls up a C++ book to show that “unsigned” simply means it cannot be negative. Wright’s says yes he knows that, he just didn’t think of how to say it in such a simple way.