Media type: E-Article Title: A Vanishing Act Contributor: Lietz, Gerard P. Published: American Association of Physics Teachers (AAPT), 2006 Published in: The Physics Teacher, 44 (2006) 9, Seite 618-618 Language: English DOI: 10.1119/1.2396786 ISSN: 0031-921X; 1943-4928 Keywords: General Physics and Astronomy ; Education Origination: Footnote: