Mystery surrounds ancient 1800-year-old metallic orb discovery.. Alien invasion enthusiasts excited

1800-year-old, once-metallic orbs have been found under an ancient pyramid in Mexico City. 
 The spheres, covered in pyrite, or fool's gold, are interesting on their own but the fact that they were found deliberately buried under a pyramid in the ancient city of Teotihuacan, once the most populated city in the world, has led some to call it an "unprecedented discovery."

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