They updated all our money not long ago...they don't do it often as it is expensive and takes forever to collect old and replace with new. I doubt we will see this in the next 40 years.
For blind people and those with vision troubles. We have some of the only currency in the world that isn't a different size and/or have some sort of raised mark in order to differentiate between bills that look quite alike if you have any vision impairment. Also, it would HELP you find the correct bill easier, as it'd be easier for everyone to differentiate.
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