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.
measuring tools
Because human senses - like vision, hearing, touch, heat/col receptors are subjective - which means that they are not very accurate nor reliable - science do not use them in measurements. Instead, measuring tools are used.