Unistable polyhedron
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An unistable polyhedron is stable on only one face. The simplest such polyhedron known requires 19 faces and was discovered independently by Richard Guy and Ken Knowlton around 1959.
An unistable polyhedron is stable on only one face. The simplest such polyhedron known requires 19 faces and was discovered independently by Richard Guy and Ken Knowlton around 1959.