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  1. Space

    Brines on Mars

    Unusually high concentration of perchlorate salts found in Martian soil suggests that the Red Planet may harbor shallow, extremely briny oceans just below its surface. The existence of these brines may explain a host of puzzles on Mars.

    By Ron Cowen
  2. Physics

    Never mind the Pollock ‘fractals’

    Scientists strengthen claim that fractal analysis is moot.

    By Laura Sanders
  3. Ecosystems

    U.S. bird populations in decline, report says

    Secretary of the Interior Ken Salazar releases a review of U.S. bird populations.

    By Solmaz Barazesh
  4. Chemistry

    Helping molecules reach meta

    Researchers find a simple way to get molecules into the meta position on an aromatic ring, opening fresh possibilities for making new compounds.