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Baghdad Battery
The Baghdad Battery refers to 3 ceramic pots all containing a tube of one metal and rod of another metal. It contains all the elements, minus the acidic liquid, and structure to make a working battery.
The anomalous problem is that these “batteries” are dated circa 250BC.
(Image ownership https://commons.wikimedia.org/wiki/File:Ironie_pile_Bagdad.jpg)
Some have proposed that perhaps these “batteries” were indeed batteries used in ancient electroplating, but that calls into question ancient knowledge, the discoveries of electricity, battery technology, aspects of chemistry, and the discovery of electroplating.
References
Ancient Canals (North America)
John Jensen some years ago called into question the origin of canals carved into the landscape of the Louisiana coast, and other areas along the American side the Gulf of Mexico.
The evidence collected of many of these canals do not match up with any known historical source, and appear to link to a time prior to European colonization of North America.
https://www.google.ca/maps/@29.7463636,-89.7055309,1489m/data=!3m1!1e3
His work can be found here:
http://www.academia.edu/3779666/Ancient_Canal_Builders_-_Overview
His online blog:
http://earthepochs.blogspot.ca/
John Jensen interview: