Despite viruses’ reputation as constant shape-shifters, the recent pandemic flu (influenza A H1N1, 2009) bears an uncanny resemblance to the 1918 flu , new research has found. Two new studies, published online March 24 in Science and Science Translational Medicine , describe a small, but crucial, structure that the two flu viruses share–and how that similarity might help prevent future outbreaks. [More]