http://www.factmonster.com/

http://www.boolify.org

(“visual” Boolean search)

http://www.dibdabdoo.com/

(younger version of fact monster)

http://www.kidsclick.org/

http://infotrac.galegroup.com/itweb/k5online

GALE Database

http://www.proquestk12.com/

ProQuest Database