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Calcite Crystal Navigation

Just finished a first reading of The Knowledge obtained at the local library. An excellent book that should be required reading for grade schools. One thing I picked up on before reading this book was that the Vikings were using calcite crystals for navigation in the far north long before the compas...
by CHoff
Sun Feb 15, 2015 8:03 pm
 
Forum: 12. Time and Place
Topic: Calcite Crystal Navigation
Replies: 0
Views: 2323

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