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Statisticly life of currency last about 25 - 40 years.

statisticly every 120 years a solar flare hits earth and melts every wire with an electrical current running through it. Just saying, we are 50 years over due. diversify!!

I made a post on my blog with more charts to this.

https://steemit.com/dollar/@sjovmaiin/the-coming-fall-of-the-us-dollar

The 18 year cycle between the euro and the dollar is interesting!