Mysterious giant sphere found in Bosnia
A giant stone sphere has been unearthed in a forest near the Bosnian town Zavidovici.
According to The Telegraph the stone has an extremely high iron content, and a radius of between 1.2 to 1.5 meters.
Bosnian archaeologist Semir Osmanagic believes it may be the oldest stone sphere made by human hands. According to his colleague Dr. Sam Osmanagich the region used to host many similar spheres well into the 20th century, but people broke them because they thought they may contain gold.
Osmanagic believes the spheres provide evidence of an ancient civilisation in the region.
Other archaeologists are less than convinced.
Discussing the Zavidovici spehere, Mandy Edwards of the University of Manchester's School of Earth, Atmospheric and Environmental Sciences told MailOnline the rock may not be man-made at all, and had been formed by the "precipitation of natural mineral cement within the spaces between sediment grains" - a process known as concretion.
This would be similar to the Klerksdorp Spheres.
Those spheres were found in mined deposits of pyrophyllite at Ottosdal, and quickly gained notoriety as some sort of evidence for some sort of ancient civilisation long before there were humans.
Except when they were cut in half they showed the tell-tale rings associated with concretion - as layer upon layer built up over the stones. They have also had people claim that they move around inside their cases all on their own, which becomes a whole lot less mysterious when you realise there is a mine near the museum that houses them.
The blasting at the mine often causes tremors - which make round things roll.