If all the human fingers and toes in the world (somewhat more than 30 billion) were free electrons and were multiplied by a billion and again by a billion, all those electrons would weigh just about one ounce avoirdupois. And yet one of those almost weightless electrons, a negative charge of electricity, as it shoots from the cathode of an X-ray tube or from the filament of a radio tube engraves its path on metal.
The paths are slim for electrons going at high speed, broader for slower moving ones. This is a phenomenon noted...
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