Phys.Org (Isle of Man, Feb. 15) -- While working to improve a tool that measures the pushes and pulls sensed by proteins in living cells, biophysicists at Johns Hopkins say they've discovered one reason spiders' silk is so elastic. Lead researcher Taekjip Ha says the new discovery came during a follow-up to research he and his team, then at Illinois, described in the journal Nature in 2010. Also: Gizmodo (Feb. 15), Science 360 (Feb. 17).