Post by Ubom Akaninyene T (@Mrfoolish)

The covers of all passports in the world have shades of only four colors: blue, red, green and black. There are no rules about this, but no one wished to use other colors.
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The covers of all passports in the world have shades of only four colors: blue, red, green and black...

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David Onyedikachi: Interesting fact, passport covers really do stick to just blue, red, green and black worldwide.