"Over the past several decades, South African miners have found hundreds of metallic spheres, at least one of which has three parallel grooves running around its equator. The spheres are of two types--'one of solid bluish metal with white flecks, and another which is a hollow ball filled with a white spongy center." Roelf Marx, curator of the museum of Klerksdorp, South Africa, where some of the spheres are housed, said: 'The spheres are a complete mystery. They look man-made, yet at the time in Earth's history when they came to rest in this rock no intelligent life existed. They're nothing like I have ever seen before. Stones, which are found in rock scientists say are billions of years old- and which rotate on their axes, captured the attention of Mr. John Hund of Pietersburg fifteen years ago.... While playing with the stone on a very flat surface at a restaurant one day, Hund realized it was very well balanced. He took it to the California Space Institute at the University of California to have tests done to determine just how well balanced it was. "It turned out that the balance is so fine, it exceeded the limit of their measuring technology and these are the guys who make gyrocompasses for NASA. The stone is balanced to within one-hundred thousandths of an inch from absolute perfection," explains Hund. Nobody knows what these stones are.One NASA scientist reportedly told Hund that they do not have the technology to create anything as finely balanced as this. He said the only way that either nature or human technology could create something so finely balanced would be in zero gravity.
Ultimately, scientists have examined them and believe them to have been formed naturally by concretions in volcanic sediment.
Perhaps not the mystery we imagined, but when you consider the earth made something so precise and so amazingly symmetric, it is a delightful find!