The text is a transcript of a video about the mystery of stone circles, such as Stonehenge, and how they were built by ancient people. The video explores different theories, such as aliens, giants, and merlin, but also presents some scientific and engineering explanations. The video also mentions a modern example of a man who built his own stone circle in Florida, and the threat of earthworms to the preservation of Stonehenge. The video ends with a promotion of the author's book.
Here are the key facts extracted from the text:
1. There are many stone circles around the world that date back to ancient times and have different purposes and alignments.
2. Stonehenge is the most iconic stone circle and consists of two types of stones: blue stones and sarson stones.
3. The blue stones were brought from Wales and the sarson stones from Marlborough, both without the use of wheels or modern machinery.
4. The sarson stones have intricate shapes that fit together like tongue and groove or convex and concave.
5. Some theories suggest that stone circles were built by aliens, giants or Merlin, but most evidence points to human engineering and teamwork.
6. Edward Leedskalnin built a coral castle in Florida by himself using primitive tools and wooden frames.
7. Wally Wallington demonstrated how to move and raise heavy stones using simple techniques like pebbles, rollers and levers.
8. Stonehenge is slowly sinking into the ground due to earthworms burrowing and depositing soil around the stones.
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