Uncategorized

  1. Humans

    Stem Cell Controversy: Scientist is retracting landmark finding

    A South Korean researcher who claimed to have cloned the first human embryonic stem cell is now asking that some of his published work be retracted.

    By Nathan Seppa
  2. Chemistry

    Mixed Message: Pheromone blend sends signal

    The meaning of a chemical message released by male Asian elephants depends on the chemical's total concentration as well as on the balance of the chemical's two forms.

    By Aimee Cunningham
  3. Animals

    Ant Iron Chefs: Larvae fix dinner but don’t sneak snacks

    Movies of an ant colony show that larvae are the ones that prepare dinner when meat is on the menu. With Video.