http://education.jlab.org/atomtour/

http://www.nyu.edu/pages/mathmol/textbook/atoms.html

http://www.chem4kids.com/files/atom_intro.html

http://www.chemicalelements.com/

http://www.webelements.com/

http://www.grc.nasa.gov/WWW/K-12/airplane/newton.html

http://teachertech.rice.edu/Participants/louviere/Newton/

http://www.edheads.org/activities/simple-machines/

http://www.ed.uri.edu/SMART96/ELEMSC/SMARTmachines/wheel.html

http://www.cosi.org/files/Flash/simpMach/sm1.swf

http://www.chem4kids.com/files/matter_states.html

http://www.chem.purdue.edu/gchelp/atoms/states.html

http://www.hhmi.org/coolscience/

http://www.walter-fendt.de/ph14e/dopplereff.htm

http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html

http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/sound/u11l1a.html

http://gets.gc.k12.va.us

http://gets.gc.k12.va.us/schools/peasley/

http://gets.gc.k12.va.us/tchrweb/klitton