One of the students in my p-chem (Physical Chemistry) class in 1978 was Sarah Barron. She had been in my general chemistry class earlier and later did her independent research with me. The subject of the research was to study the metal contents of human saliva to see if there were differences among races and whether these contributed to other trends, such as the build up of plaque or tooth decay. The metals studied were calcium, iron and copper. She was also Margaret’s first swimming teacher and often babysat for our children. Here in this picture she is holding a cake with a periodic table on it!