Historians have long wondered at the ability of Vikings explorers to travel long stretches of open water. Some say they used transparent calcite crystals — whose properties can allow a skilled sailor to guess the position of the sun during overcast or foggy days — as navigational aids.
Read more: http://www.foxnews.com/world/2013/03/08/researchers-say-crystal-found-at-bottom-english-channel-may-be-fabled-sunstone/?intcmp=obnetwork#ixzz2NSzvgHBs
http://www.foxnews.com/world/2013/03/08/researchers-say-crystal-found-at-bottom-english-channel-may-be-fabled-sunstone/?intcmp=obnetwork
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