Pick a date, scroll the world map, see what else was happening at the same time
Meanwhile Map answers a question history books struggle with: when you read about an event, what else was happening in the world at the same time? Pick a date and a time window, scroll the world map, and see contemporaneous events — OpenHistoricalMap period borders plus Wikidata events with Wikipedia popups. The whole thing is a single fully client-side static page.
Author 29b launched it on Show HN, describing it as "vibe coded as an experiment". Created 2026-10-01, last push 2026-10-05, MIT — a delightful example of a one-page vibe build with real scholarly utility.