Player2 on 24 August 2012
The fact that they used something, or that something (those jars) have an alternate use doesn't mean that they know everything about it.
What will think those that find the remainings of our civilization thousands of years later when they find this?
http://www.neatorama.com/2006/11/30/uranium-glasswares/
Or hatters using mercury.
Accomulated sugar can be used to produce electricity. Does this mean that indians discovered piezoelectricity 500 BC?
