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  1. Earth

    Northern Refuge: White spruce survived last ice age in Alaska

    Genetic analyses of white spruce trees at sites across North America suggest that some stands of that species endured the harsh climate of Alaska throughout the last ice age.

    By Sid Perkins
  2. Earth

    What’s New in the Water? Survey tallies emerging disinfection by-products

    By analyzing drinking-water samples from U.S. treatment plants, a multi-institute research team has identified some unexpected by-products of disinfection processes.

    By Aimee Cunningham
  3. Planetary Science

    Titan’s Lakes: Evidence of liquid on Saturn’s largest moon

    New radar images strongly suggest that Saturn's giant moon Titan contains lakes of liquid hydrocarbons, marking the first time that researchers have found compelling evidence for bodies of liquid on the surface of any object beyond Earth.