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  1. Earth

    Wrong Number: Plastic ingredient spurs chromosomal defects

    The primary chemical in some plastics causes female mice to produce eggs with abnormal numbers of chromosomes.

    By Kendall Morgan
  2. Materials Science

    A New Cool: Prototype chills fast and electrifies, too

    Researchers have incorporated an efficient thermoelectric material into a prototype device that can cool or produce electricity.

    By Jessica Gorman
  3. Math

    Zeroing In on Catalan’s Conjecture

    Fermat’s last theorem is just one of many examples of innocent-looking problems that can long stymie even the most astute mathematicians. It took about 350 years to prove Fermat’s scribbled conjecture, for instance. Now, Preda Mihailescu of the Swiss Federal Institute of Technology in Zurich has proved a theorem that is likely to lead to […]

    By Ivars Peterson
  4. Math

    Zeroing In on Catalan’s Conjecture

    Fermat’s last theorem is just one of many examples of innocent-looking problems that can long stymie even the most astute mathematicians.