Word: polyhedra
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...devoted his life to inventing construction systems of extreme economic efficiency, and to applying these to "livingry" rather than "weaponry." Perhaps his greatest contribution in this respect has been his work with the tetrahedron, a four-faced pyramid which Fuller has discovered to be the most resistant of all polyhedra to external pressure. By combining many tetrahedra into a spherical shape (the sphere can withstand the greatest internal pressures), Fuller constructed his geodesic dome, an extremely light and economical structure of extraordinary strength...
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