Over the past few decades, miners near the little town of Ottosdal in Western Transvaal, South Africa, have been digging up hundreds of mysterious metal spheres. These spheres measure between 25 and 100 mm in diameter, and some are etched with three parallel grooves running completely around the equator. Two types of spheres have been found. One is composed of a solid bluish metal with flecks of white, the other is hollowed out and filled with a spongy white substance.
These spheres are reportedly so delicately balanced that even with modern technology, they would need to be made in a zero gravity environment to attain these characteristics. These objects have become known as the Klerksdorp spheres.
Here's related reading to what I quoted
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exNihilo: Doesn't seem like they are out of place at all. According to the linked Wikipedia entry, they are the perfectly natural result of normal geological processes.
These spheres are reportedly so delicately balanced that even with modern technology, they would need to be made in a zero gravity environment to attain these characteristics.
This seems incredibly exaggerated. Just look at the pictures in the Wikipedia entry and you can see they have numerous imperfections.