This is the PowerPoint from Priscilla's 2015 presentation at the annual conference of the American Montessori Society. The audio of this presentation is available through the American Montessori Society. Also included in this download are the notes attendees received and a diagram of concepts for matter and atoms. Teachers may wish to see the book recommendations and experiments that Priscilla showed. This presentation includes information about chemical safety. Priscilla also read from a book that is not on the notes or slides. It is Your Atomic Self by Curt Stager.