Number 123 (Story #4), April 9, 1993 by Phillip F. Schewe and Ben Stein THE PHYSICS TEACHER , the monthly magazine of the American Association of Physics Teachers (AAPT), is thirty years old this month. Articles in 1963 covered such topics as satellite orbits, physics for girls, and sinking ice. This anniversary issue contains articles about an effort to legislate the value of pi (the Indiana State House tackled this tough issue in 1897), electrorheological liquids, Isaac Newton's 1701 experiment on thermometry, tips on how to use a blackboard eraser as a physics demonstration prop, and a list, formulated by Vladimir Braginshin of Moscow State University, of some of the outstanding problems in physics today. Examples include the search for discrepancies between the electric charge of the proton and electron, the equivalence of inertial and gravitational mass, and the search for a nonzero electric dipole moment for the neutron (The Physics Teacher, April 1993.)