This paper examines gender dynamics in unsolicited donations to the CSTM. Vast majority of objects that come to the CSTM through passive collecting are donated by men or donated by wives and daughters to commemorate work and lives of their husbands and fathers. Very few donations are originated by women who want to preserve another female’s contribution to the science, technology and medicine. Moreover, in Adamek’s 20 years at the Museum no men has ever called to donate objects associated with his mother’s, wife’s or daughter’s work. The paper looks at possible reasons for this phenomenon and attempts to answer several key questions. What is the relationship of men and women with the CSTM? Is there a difference in the way that men and women in Canada perceive their national museum of science and technology? Do generational dynamics play a role? Is there knowledge lost because of the silences in the collection? What do these silences tell us about Canadian scientific and technological heritage? The paper also looks at strategies employed by the curator to mitigate the situation.