PHILADELPHIA—According to several witnesses, bus passenger Marie Wallace apparently believes she exists in a universe wherein curried shrimp does not give off any odor. Wallace, who demonstrated her conviction Saturday by eating large amounts of the food from a Styrofoam container while traveling on a crowded Greyhound coach from Philadelphia to Boston, is reportedly under the impression that aromatic molecular compounds do not travel through space and react with olfactory chemoreceptor cells in the human nose. Passengers also suggested that Wallace believes sound waves do not carry within a narrow, enclosed vehicle, judging from the animated seven-minute phone conversation she had with her friend Deb about her friend Deb's ex-husband, Jim.