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Lasers
SciShow Tangents
SciShow Tangents - A Trivia Question
The first year that an item marked with the UPC code was used at checkout? No, first half, 1951 is my guess. In the first half of the 20th century, a man named Joe Woodland was at the beach when he drew up the idea for the barcode in the sand. He devised a system inspired by Morse code that used wide and narrow lines to identify products. That system would later become the basis for the universal product code,. which uses lines and lasers to help scan items at stores.
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