I guess even our new bills will be a thing of the past now that a US District Judge sided with the American Council of the Blind. The ACB wanted American paper currency to have each bill be distinguishable from the others. Evidently other countries already do this, so saith the article anyway. The story is HERE.
I've honestly never even thought about this. I guess I've heard about the blind being able to distinguish between coins by size and feel of the edges such as a quarter having ridges around its edge and a nickel being smooth. I suppose it goes to show just one more thing I take for granted everyday.