What happened is a chunk of Aluminium was found buried in Romania and they think it was forged tens of thousands of years ago. The problem is we learned how to extract aluminium from its ore just recently in the 1820s I think, around the time when we were making slavery illegal in the UK at the start of the industrial revolution. It is very hard to extract aluminium from its ore because heat and electricity have to be combined on the ore to free it.
Some people think the aluminium fragment came from an alien star ship thousands of years ago. Others think it came from meteorite. Some people think it was wedged into the ground when a German bomber plane crashed at the site but no one really knows.
