Almost fifty years ago, when Haraldur Sigurdsson first came to the University of Rhode Island from Iceland, he got interested in what makes some clam shells more purple than others.

Just as many-faceted as the birthstones themselves, though, are the origins of their names. A great many of them came into ...

In the depths of the San Lázaro rock-shelter in Segovia, Central Spain, archaeologists from the Complutense University of ...