For those seeking information on the properties of materials at the nanoscale and the impact of grain size, literature is recommended over traditional books. A key starting point is the Hall-Petch effect, which describes grain size strengthening. Notable research by Chris Schuh from MIT highlights the relationship between grain size and indentation hardness in nanocrystalline nickel alloys. Additionally, the work of Dieter is suggested as a foundational resource to understand these concepts before delving deeper into the subject.