The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per the source: "A construção do Senna Tower teve início no dia 29 de setembro de 2025".
Wikipedia confirms the Senna Tower "broke ground in the second half of 2025," consistent with the pin's stored September 29, 2025 date, which falls within that window though the page doesn't cite the exact day.
The page could not be fetched, but its title - a Portuguese-language enthusiast blog on the "race" for the world's tallest residential building, published December 2025 - is a weaker, non-primary source for the groundbreaking date the pin describes.[1]
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.