In 226 BC, an earthquake brought down the tallest statue in the ancient world, the Colossus of Rhodes.
This update holds steady. Duplicated and transferred posts can only go to boards now, not sandboxes. The Enter URL dialog tells you when a web address isn’t valid, and canceling closes it without adding anything. When reactions are on, you can show contributor names and times on both comments and reactions. Swiping back from an expanded post now closes it and keeps you on the board.