I invented a telephoneAlexander Graham BellIn addition to the inventor, he was engaged in research activities as scientists, engineers and others. As his mother and wife were deaf "deaf" deaf, it is ...

The tetrahedral geometry of four-coordinate carbon atoms is a steadfast property of organic compounds. Nevertheless, chemists are still attracted to the possibility of twisting or squashing a ...

Research into solid-oxide fuel-cell electrolytes has focused mainly on fluorite or perovskite-type oxides 3,4,5,6, which are doped with acceptor ions to introduce oxide-ion vacancies. Oxide-ion ...

Consider what happens when a vertex of one tetrahedron pierces the face of a second tetrahedron to form a new, more complicated polyhedron. In the resulting geometric form, one triangular face has a ...