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Extensive edits

The page had been flagged as having multiple issues.  The notice cited ""original research,"" and mentioned a need for improved references and general cleanup.

I kept as much of the original page as I could, but most sections had to be rewritten, or eliminated because of  unsupported (or unsupportable) claims.  Empty sections were deleted, inappropriate links removed.  Presentation has been cleaned up, and references have been provided.  When time permits, I'll add a video and images gallery.

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