These are some great web sites. 

                              SCIENCE

http://science.howstuffworks.com/cell.htm    

http://search.msn.com/local/results.aspx?FORM=PHRE&q=Chromosomes

                             SOCIAL STUDIES

http://www.google.com/search?hl=en&q=world+history&btnG=Google+Search

                   http://www.google.com/search?hl=en&lr=&q=UNITED+UTATES+history&btnG=Search

Underground Railroad--History of Slavery, Pictures, Information