Seth Shostak Quotes
Virtually any pointed edifice is considered a candidate for alien engineering. After all, how could the Egyptians or Mayans have possibly stacked up stone blocks into pyramids?
Citations
Shostak, Seth. "Did Aliens Build the Pyramids?" HuffPost, BuzzFeed, 14 Aug. 2012.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.