Physics Instructional Resource Association - Forum http://physicslearning2.colorado.edu/ Thu, 22 Feb 2018 10:39:23 +0000 Kunena 1.6 http://physicslearning2.colorado.edu/pira/components/com_kunena/template/default/images/icons/rss.png Physics Instructional Resource Association - Forum http://physicslearning2.colorado.edu/pira/ en-gb