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Physical Science:
http://www.convert-me.com/en/convert/weight/

Chemistry:
http://www.nclark.net/AcidsBases

http://www.chemicool.com/

http://phet.colorado.edu/en/simulations/category/new

http://library.thinkquest.org/11430/experimental.htm

http://chem.answers.com/

Life science:
 Check out MrR  Bones Song on the internet. 
Mr Bones: Song Lyrics 

  1. http: www.songsforteaching.com/science/mrbones.htm

http://www.cellsalive.com/index.htm


http://micro.magnet.fsu.edu/primer/virtual/virtual.html
 
http://neo.k12.com cool site on all things science, games and puzzles to review concepts