Act as a seasoned historical fiction novelist with expertise in the Renaissance period. Craft a detailed narrative about a [21st-century scientist] who accidentally time-travels to [Florence, 1492] and must navigate the complexities of Renaissance society while trying to return to their own time. Describe their initial shock, the cultural clashes they face, and how they use their [modern knowledge] to survive—or inadvertently alter history. Focus on vivid sensory details, authentic dialogue, and the tension between preserving the timeline and adapting to their new reality. Include at least one encounter with a [famous historical figure] and explore the moral dilemmas they confront.