Why Did These Vikings' Bones Appear Older Than They Are?
Clip: Season 46 Episode 10 | 2m 18s | Video has closed captioning.
Archaeologists discovered a mass grave of what they thought to be ninth-century Vikings. But for some reason, the radiocarbon dates of their bones, found by measuring a radioactive carbon isotope, appeared much older.
Problems Playing Video? | Closed Captioning