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| | Encyclopedia: Tehran (Site not responding. Last check: 2007-11-03) |
 | | Two digital voltmeters The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. |
 | | A museum is typically a non-profit, permanent institution in the service of society and of its development, open to the public, which acquires, conserves, researches, communicates and exhibits, for purposes of study, education enjoyment, the tangible and intangible evidence of people and their environment. |
 | | Art (or the creative arts) commonly refers to the act and process of making material works (or artworks) which, from concept to creation, hold a fidelity to the creative impulse. |
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