Sea Stewards

In a pair of new books, on coral reefs and sperm whales, two impassioned ocean lovers offer contrasting visions of how to safeguard its splendors.

Who’s Who on the Savannah

Studying the social knowledge of a troop of baboons in Botswana, Penn researchers Dorothy Cheney and Robert Seyfarth gain insights into monkey cognition—and our own.

James Thomson and the Holy Grail

In 1998, graduate alumnus Dr. James Thomson won the race to isolate and culture human stem-cells for a sustained period—one of the holy grails of medical science—but he can’t outrun the controversy generated by his work. Increasingly, he isn’t trying.