With Joan Skolnick and Carol Langbort, in 1982 Day coauthored How to Encourage Girls in Math and Science: Strategies for Parents and Educators. This book grew out of the Novato Math/Science Sex Desegregation Project, Novato Unified School District, Novato, California, where Day had worked as a math/science specialist from 1979 to 1981. During the 1980s, Day taught chemistry and biology at Laney College in Oakland, and worked as a science writer, administrator, and manager of precollege education programs at Lawrence Berkeley National Laboratory.
