Classroom Demonstrations: Learning Tools Or Entertainment?

Department of Physics and Division of Engineering and Applied Sciences Program in Molecular Biology and Education, Harvard University, 9 Oxford St., Cambridge, Massachusetts 02138 a) Present address: Department of Physics and Astronomy, Swarthmore College, Swarthmore, Pennsylvania 19081 b) Present address: National Research Council, 500 Fifth St. NW, Washington, District of Columbia 20001 c) Present address: McKinsey & Co., 600 Fourteenth St. NW, Washington, District of Columbia 20005 To whom correspondence should be addressed. e-mail: [email protected]