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polyhedron
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Figure 3: (Left) A prism whose base is an equilateral triangle transformed by a screw operation and a caving in of the side faces into (right) an eight-faced polyhedron. The resulting polyhedron cannot be split into tetrahedra with their vertices at the vertices of the polyhedron.
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Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
Define It: Math Terms
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New Seven Wonders of the World
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Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,
Which Religion Is the Oldest?
Marriage. A couple getting married during a church wedding ceremony. (religion, ceremony, bride, groom)
The Seven Sacraments of the Roman Catholic church
All Saints Day. All Souls Day. Candles in cemetery in Poland on All Saints Day, November 1. All Souls Day, November 2. Christian church, All Hallows, Solemnity of All Saints, Feast of All Saints, purgatory, Roman Catholic church
7 Unique Burial Rituals Across the World

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Photos

Figure 3: (Left) A prism whose base is an equilateral triangle transformed by a screw operation and a caving in of the side faces into (right) an eight-faced polyhedron. The resulting polyhedron cannot be split into tetrahedra with their vertices at the vertices of the polyhedron.
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Quiz
Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
Define It: Math Terms