Library of Congress:
http://www.loc.gov/
World Book Online:
http://www.worldbookonline.com/wb/Login?ed=wb
Fact Monster:
http://www.factmonster.com/
Pioneer Library:
http://pioneer.uen.org/k12/index.jsp
Citation Machine (for Bibliographies):
http://www.citationmachine.net/
Scientist Facts:
http://www.sciencekids.co.nz/sciencefacts/scientists.html
Scientist Biographies:
http://www.sciencekids.co.nz/videos/famousscientists.html
Inventors and Scientists:
http://kids.usa.gov/teens/science/scientists/
http://www.loc.gov/
World Book Online:
http://www.worldbookonline.com/wb/Login?ed=wb
Fact Monster:
http://www.factmonster.com/
Pioneer Library:
http://pioneer.uen.org/k12/index.jsp
Citation Machine (for Bibliographies):
http://www.citationmachine.net/
Scientist Facts:
http://www.sciencekids.co.nz/sciencefacts/scientists.html
Scientist Biographies:
http://www.sciencekids.co.nz/videos/famousscientists.html
Inventors and Scientists:
http://kids.usa.gov/teens/science/scientists/