In the 10th century B.C., in the hill country south of Jerusalem, a scribe carved his A B C's on a limestone boulder - actually, his aleph-beth-gimel's, for the string of letters appears to be an early rendering of the emergent Hebrew alphabet. Archaeologists digging in July at the site, Tel Zayit, found the inscribed stone in the wall of an ancient building. After an analysis of the layers of ruins, the discoverers concluded that this was the earliest known specimen of the Hebrew alphabet and an important benchmark in the history of writing, they said this week. If they...