Sadly, it's not that unusual to find yourself in a difficult situation that may require the help of a stranger. Whether it be a threat to your safety, or the need for a helping hand at a difficult ...
The basic idea behind the bar code came from research by N. Joseph Woodland and Bernard Silver in the late 1940s. In the early 1960s, David J. Collins pioneered a way to scan bar codes with flashes of ...
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