Try these search engines when doing research...
http://www.safesearchkids.com/
http://www.kidrex.org/
http://www.kidtopia.info/
http://gws.ala.org/
http://www.dkfindout.com/us/
http://www.infoplease.com/
http://www.factmonster.com/
http://www.kidsites.com/
http://www.kidzsearch.com/
http://www.sweetsearch.com/
http://www.weatherwizkids.com/
http://www.basicplanet.com/
http://www.kiddle.co/