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spec: Topics include urban demographic changes and other population trends , as well as changes in the conduct of work , family life , and recreation . For fast PC circuits , cycle time is often specified in ns ( nanoseconds , or billionths of a second ) . " To create a material with the same abilities , the researchers manipulated two characteristics - - roughness and nanoporosity ( spongelike capability on a nanometer , or billionths of a meter , scale ) . On average , the current during beam-on would have been about 1 mA . And you can now view a grade chart by clicking on the number of graders that appears next to the average grade .