Every person on the English Wikipedia, sliced by where and when they were born, their gender, and what they did. The underlying database has ~1.9 million people and is built straight from Wikidata. Birth years are capped at 1500–2010 — earlier data is patchy, later cohorts are mostly too young to be Wikipedia-notable yet.
Never explain. Your friends do not need it and your enemies will never believe you anyway.