- Historians make inferences about the past based on evidence from primary and secondary sources, recognizing that historical accounts are interpretations influenced by context rather than purely factual records. - Our understanding of events like the Boston Massacre and figures involved like Crispus Attucks has changed over time through expanding historical analysis and additional sources of information. - Wikipedia in particular has evolved our shared knowledge about the Boston Massacre through collaborative contributions from many editors that have greatly expanded the initial article while still singling out Crispus Attucks as the first casualty.