Pyramidal object always corrects itself

A peculiar pyramidal shape, devised by mathematicians, always comes to rest on its base, slowly and uncannily righting itself when placed on other sides. The object confirms John Conway's longstanding but unproven conjecture regarding the stability of tetrahedra.

The tetrahedron, which weighs 120 grams and measures 50 centimeters along its longest side, is made of lightweight carbon fiber and dense tungsten carbide.

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