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.
disjoint sets
In mathematics, two sets are sai to be disjoint if they have no element in common. For example, {1, 2, 3} and {4, 5, 6} are disjoint sets.