The EURion Constellation and how it stops counterfeiters

If you enjoyed the video about anti-counterfeiting measures on bank notes, you might like this video here about the EURion Constellation, a somewhat secretive series of rings seen on many bank notes worldwide that tell a computer that what it's looking at is currency. It is just one of the many ways a copy machine or computer application prevents copying or altering of a bank note.

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Did you know that you can measure the distance between points on Google Maps?