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.
wqo
In mathematics, specifically orer theory, a well-quasi-ordering or wqo is a well-founded quasi-ordering with an additional restriction on sequences - that there is no infinite sequence xi with for all i < j.