Overheard “It’s not as if we were asking (the chimps) to give blood or write cheques to tsunami victims.” Joan Silk of the University of California, Los Angeles, part of a team that looked for evidence that chimpanzees (Pan troglodytes) will help other members of their group. The study revealed that apes don’t seem to give a monkey’s ass about their pals. (Nature) “Sword swallowing thus raises at least two uncertainties. What is the incidence of complications, and how often do they stomach it?” Brian Witcombe, radiologist consultant, Gloucestershire Royal Hospital, UK on the incidence of esophageal perforations and other…