"A Mariner original."

Includes bibliographical references (pages 315-318).

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 / 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.