Chemical analysis of ancient corncobs found in Chaco Canyon produced more evidence that the Anasazi town there was the powerhouse of a widespread culture.
The Kensington Runestone, whose authenticity has been in dispute since it was discovered in 1898, has gone on display at Sweden's National Historical Museum.
A recent discovery at the site of Morgantina shows that the aboveground barrel vault goes back to the third century B.C. and may have originated in Hellenistic Sicily.