At the request of the provost he taught a class in ancient Greek literature in translation, sympathizing with students who found Thucydides impenetrable: The Modern Library edition has one map of the entire Hellenic world, with 180 labels on it.

FORBES: Homemade Herodotus

The more accurate map of his genome, published Tuesday in The Public Library of Science, an online journal, is most important because it is going to help scientists make many more such maps--and because it opens the door to people being willing to have their genome's sequenced.

FORBES: All Mapped Out

Private-equity executive David Rubenstein gave the first known map of the U.S. made after the Revolution to the Library of Congress and not the National Archives, as was incorrectly implied in one reference in a U.S. News article on Monday about Mr. Rubenstein's purchases of historical papers.

WSJ: Corrections & Amplifications

But in the world of big-and small-money map theft, it's more like taking candy from a baby--or in this case, a library: Simply walk in, slice 'em out of a book and walk out.

FORBES: Atlas Unbound