Encyclopedia Britannica: www.britannica.com

Kids Information Please:  www.infoplease.com/

King County Library System: www.kcls.org  

King County Quick Reference: www.kcls.org/findit/quickref.html

Seattle Public Library: www.spl.lib.wa.us/searchnet/engines.html

Zoobooks http://www.zoobooks.com/gatewayPages/gateway1Kids.html