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AI Summary
- Ancient cultures across Europe built massive stone structures with extraordinary precision using exact same measurement of 2.72 feet called Megalithic Yard appearing at Stonehenge and Scottish Isles
- Measurement appeared at sites separated by thousands of miles and built across thousands of years; structures were sophisticated machines tracking celestial movements with astonishing accuracy
- Megalithic Yard connects to fundamental constants of universe raising questions about how ancient people without writing achieved such precision and why construction suddenly stopped
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