I've read several times speculation that the Vikings used polarized light to help navigate. They didn't know that's what they were doing, they just discovered “sunstones” – calcite crystals – that naturally polarized light and could be used to tell where the sun was even on a cloudy day, and before sunrise or after sunset.
Now it appears that scientists have actually found a sunstone in the wreck of a Viking ship.
Awesome dudes, those Vikings...
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