Physics Education R&D Grouphttp://wiki.physics.ncsu.edu/PER/RecentChangesRecentChanges at Physics Education R&D Group- HelpForBeginnershttp://wiki.physics.ncsu.edu/PER/HelpForBeginners?action=diff2007-05-04T02:52:44ZJonGaffney1178247164000000updatedhttp://wiki.physics.ncsu.edu/PER/HelpForBeginners?action=diffhttp://wiki.physics.ncsu.edu/PER/HelpForBeginners?action=info