Uncategorized

  1. Humans

    Small World After All: Short e-mail chains reach targets worldwide

    A large-scale study of e-mail users has borne out the notion that one person on the planet can reach any other person through a chain of about six social ties.

    By Erica Klarreich
  2. Chemistry

    Amending the Genetic Code: Yeast adds new amino acids to its proteins

    Researchers have created yeast cells that add one of five unnatural amino acids to their natural 20-piece construction set.

    By Jessica Gorman
  3. Ecosystems

    Risky High Life: Mountain creatures prove extra-vulnerable

    Some of the species hardest hit by climate change will be those living in particular mountain highlands.

    By Susan Milius
  4. Earth

    Saltier Water: Climate change can slow ocean’s absorption of carbon dioxide gas

    A decrease in precipitation over the Pacific Ocean north of Hawaii in recent years has left the ocean there saltier and has diminished its ability to soak up carbon dioxide.