safe search engine for encyclopedia
http://dictionary.reference.com/
http://www.online-calculator.com/full-screen-calculator/
http://www.factmonster.com/atlas/
http://www.googlejunior.com/ (use for an image search)
http://www.metric-conversions.org/conversion-calculators.htm
http://www.onlineconversion.com/temperature.htm
http://www.oanda.com/currency/converter/