A single loaf of bread played an unexpected role in changing history. The document describes how Vladimir Lenin, while living in Siberia, used a loaf of bread to create an early form of invisible ink by hollowing it out to use as an ink pot for milk. Words written with this milk invisible ink would only become visible when the page was heated, allowing secret messages to be sent. This innovative use of a simple loaf of bread allowed Lenin to spread his revolutionary ideas without detection, ultimately contributing to significant historical changes in Russia.