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  1. Health & Medicine

    Protein interacts with hormone that quells hunger

    A protein that's more abundant in the blood of obese people inactivates leptin, a hormone that controls hunger.

    By Christen Brownlee
  2. Planetary Science

    Ice among the rocks

    A newly discovered trio of icy comets, hidden among the thousands of rocks in the main asteroid belt, may be part of a previously unknown class and a primary source of water for the dry, early Earth.

    By Ron Cowen
  3. Ecosystems

    Antarctic birds are breeding later

    Rising global temperatures are causing Arctic birds to breed earlier in the spring, but for Antarctic birds, the reverse is true.

    By Carolyn Gramling
  4. Math

    Men, Women, Cars, and Crashes

    Why do men, whether as drivers or pedestrians, have a much higher rate of traffic fatalities than women do? For more math, visit the MathTrek blog.