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  1. Earth

    Equal Opportunity Outcome: Different pollutants show same impact

    At concentrations present in the environment, each of three dissimilar toxic agents can seize control of a signaling pathway that regulates developing cells in the central nervous system.

    By Aimee Cunningham

  2. Natural-Born Addicts: Brain differences may herald drug addiction

    Differences in the behavior and the brain receptors of rats seem to predict which of the rodents will become cocaine addicted.

    By Christen Brownlee

  3. 19801

    This article describes an elegant study. I found the 7 percent addiction-susceptible figure interestingly similar to the 10 percent of people who drink alcohol who become addicted. I wonder if similar percentages of other species are impulsive and vulnerable.