Share something that made you stop and say 'wait, really?'

Engineering feats, natural phenomena, strange history, clever design, skills that look impossible: this room is for things that make people stop scrolling and stare. Types of posts that land well:

Add context with every post: what it is, where it's from, and a source if you have one. Fascinating things are also the most likely to be faked or mislabelled. Share on the board, add extra details in the comments, and bring your "how does that even work?" questions to the chat.