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Get Off the Earth (1896) — The Patent Sam Loyd Took Out on a Miscount
In 1896, puzzle columnist Sam Loyd patented a rotating vanishing puzzle called Get Off the Earth. This piece traces the real mechanism behind its disappearing figure, its 1880 predecessor The Magic Egg Puzzle, its roots in Loyd's 1858 Trick Mules, and the trail this rearrangement trick has left in optical-illusion puzzles today.
15数字推盘（1880） — 萨姆·劳埃德骗倒世界的那一步无解棋局
1880年初，「15数字推盘」的狂潮席卷美国与欧洲。然而被世人奉为发明者的萨姆·劳埃德，实为在狂潮消退十六年后才冒领功劳的冒充者。本文追溯这个木盒的真实来源，以及劳埃德以悬赏为名的「14与15对调的盘面」在数学上绝对无解的1879年证明，并从历史角度重读滑块拼图留给现代数字谜题设计的遗产：「可解性的保证」。
