Crystal Skulls -- although the Mitchell-Hedges specimen is the most famous, there are many more. The questions that must be asked are: are they fraudulent artifacts?; Are they from a lost civilisation (e.g., Atlantis)?; Are they paranormal?; or is Indianna Jones correct and they are the skulls of extra-terrestrials? 

You can see the British Museum skull here https://www.britishmuseum.org/collection/object/E_Am1898-1

Listen to Ansir & Sophia as they discuss the skulls at or via all good podcast platforms.

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