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A mysterious, giant sphere has been discovered in Bosnia that scientists say is "over one hundred thousand years old".

Dr Sam Osmanagich is an archaeologist who helped to discover the stone and said it's the largest in Europe.

He believes it was man-made and said "in order to shape it, whoever made it had to have very advanced technology".

Osmanagich believes it proves the existence of an advanced lost civilisation dating back thousands of years.

This clip is originally from 5 live on Wednesday 13 April 2016.