Last Updated: Thursday, May 2, 2013, 15:56
Archaeologists, using a camera-equipped robot, have discovered hundreds of enigmatic, once-metallic spheres buried deep beneath an ancient pyramid in Mexico City.
Last Updated: Monday, February 4, 2013, 15:27
Thousands of tiny purple spheres have mysteriously popped up in the middle of America`s Arizona desert, completely isolated from the rest of the terrain.
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