Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
rigid
In mathematics, suppose C is a collection of mathematical objects (for instance sets or functions). Then we say that C is rigi if every cC is uniquely determined by less information about c than one would expect.