NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Science Olympiad website http://www.soinc.org
Famous women scietists http://www.women-scientists-in-history.com/women.html
famous scientists http://www.famous-scientists.net
general science facts http://www.factmonster.com