How do barcodes and scanners even work?

Описание: Barcodes are everywhere. But, what do they actually mean?
And better yet, how on earth is a laser capable of reading one?
Let’s find out!

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Chapters
0:00 I nerd-sniped myself on this one…
1:09 The history of barcodes and scanners
8:02 The main parts of a barcode
10:14 The encoding of the UPC barcode
14:59 The Symbol LS-7000 (CM)
15:46 A look at the inside of a barcode scanner
19:54 A short physics lesson on HeNe lasers
25:58 How do these random components read a barcode?
28:04 How does the computer know what it’s seeing?
30:45 Taking the barcode scanner for a test drive
36:31 Bunny!