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WikiPedia: Unfavorable Semicircle http://www.bbc.com/future/story/20160225-the-quest... https://gazettereview.com/2016/10/top-10-strangest... https://www.unfavorablesemicircle.com/ https://www.cnet.com/news/unravel-the-secrets-of-t... https://www.atlasobscura.com/articles/the-unsettli...