Although he still hadn't found a use for microspheres, Silver shared his discovery with colleagues. His persistence finally paid off in 1973, when his adhesive caught the attention of 3M employee Art Fry. When Fry first heard of Silver's invention, he felt what he called a "eureka moment"—a sudden realization. Fry felt an "adrenaline rush" from the plans swirling in his head —he could use Silver's adhesive to stick bookmarks into the pages of his favorite books. His non-sticky bookmarks were regularly falling out; with the adhesive, they would remain securely between the pages.