Dropa Discs

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I've never seen this discussed on /x/ before but for some reason I remember watching a History channel documentary all about Dropa Discs when I was a kid and it's stuck with me.

>https://en.wikipedia.org/wiki/Dropa_stones

>http://www.crystalinks.com/dropa.html

They are flat, donut-shaped discs of stone with hieroglyphics carved onto them. Supposedly they were found in rural china decades ago alongside elongate skulls. Naturally there is a connection to aliens there, with people believing that they are evidence of alien contact thousands of years ago and the symbols on disc relate to this. They are said to have unique properties, such as reacting in specific manners when introduced to electrical current and having a "hum" to them.

Furthermore, it is claimed that these discs have been found all over the world and not just in China. That being said the History channel documentary is the only time I can recall ever being exposed to them, I've never seen it discussed here or anywhere else and most of the online content relating to them is over a decade old. Is it a proven hoax or just forgotten?