Mixed up / Katherine Bagley --The great forgetting / Nicholas Carr --The social life of genes / David Dobbs --What our telescopes couldn't see / Pippa Goldschmidt --A race to save the orange by altering its DNA / Amy Harmon --A life-or-death situation / Robin Marantz Henig --23 and you / Virginia Hughes --Why the brain perfers paper / Ferris Jabr --O-rings / Sarah Stewart Johnson --When animals mourn / Barbara J. King --Where it begins / Barbara Kingsolver --Danger! This mission to Mars could bore you to death! / Maggie Koerth-Baker --The lost world / Elizabeth Kolbert --Awakening / Joshua Lang --Imagining the post-antibiotics future / Maryn McKenna --The return of measles / Seth Mnookin --Ants go marching / Justin Nobel --TV as birth control / Fred Pearce --The madness of the planets / Corey S. Powell --Learning how to die in the Anthropocene / Roy Scranton --Under water / Kate Sheppard --Twelve ways of viewing Alaska's wild, white sheep / Bill Sherwonit --The separating sickness / Rebecca Solnit --Trapline / David Treuer --The rebirth of Gorongosa / E.O. Wilson --Bringing them back to life / Carl Zimmer.