What I Amazed For
When I was just a kid, I often amazing things that are technology made and impossible to made by hand. Like when we are in a shoppping mall, I saw the barcode scanner, all the items we shopped are automatically summed up by just the barcode in every item. I found it now that it is a laser reader because what I only saw in a barcode scanner is the red light horizontal laser. Actually till now I wonder how is this possible.
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