Long dismissed as accidental additions to Viking graves, prehistoric "thunderstones"—fist-size stone tools resembling the Norse god Thor's hammerhead—were actually purposely placed as good-luck talismans, archaeologists say.
Using fire-starting rock such as flint, Stone Age people originally created the stones to serve as axes. But the Vikings, whose Iron Age heyday lasted from about A.D. 800 to 1050, saw the primitive tools as lightning repellent.
Because the axes predate the Viking age by thousands of years, archaeologists have long seen the stones as random artifacts, perhaps stirred up from earlier, lower burials or dropped in centuries after the Viking era.
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