Number 76 (Story #4), April 17, 1992 by Phillip F. Schewe and Ben Stein WATCHING BEER BUBBLES RISE allows one to calculate the radius of the carbon dioxide molecule. In response to an article in the October 1991 issue Physics Today ("Through a Beer Glass Darkly," by Neil Shafer and Richard Zare) T.G.M. van de Ven and S.S. Dukhin of McGill University use the measured properties of CO2 bubbles in beer to compute a radius for them of about 3 angstroms. (Letter in the April 1992 Physics Today.)