In physics the observer effect is the disturbance of an observed system by the act of observation this is often the result of instruments that by necessity alter the state of what they measure in some manner a common example is checking the pressure in an automobile tire this is difficult to do without letting out some of the air thus changing the pressure similarly it is not possible . Faster than light also superluminal ftl or supercausal communications and travel are the conjectural propagation of information or matter faster than the speed of light the special theory of relativity implies that only particles with zero rest mass may travel at the speed of light tachyons particles whose speed exceeds that of light have been hypothesized but their existence would . Growth of mnbi 2 te 4 occurs over a very narrow temperature range and many stable compositions exist in the homologous series mnbi 2 n te 3 n 1 and were not reported on the available phase diagram all of these growths were performed using al 2 o 3 crucibles with the excess flux expelled using a centrifuge immediately after removing the crucibles from the hot furnaces
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