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  1. Paleontology

    Fossils found under tons of Kitty Litter

    Excavations at North America's largest Kitter Litter mine have yielded fossils of ancient aquatic reptiles, as well as evidence of a tsunami generated by the extraterrestrial impact that killed off the dinosaurs about 65 million years ago.

    By Sid Perkins
  2. Health & Medicine

    Pregnancy spurs a tumor suppressor

    Pregnancy hormones may prime breast cells to maintain a supply of p53, a cancer suppressor protein, thus accounting for why women who have undergone pregnancy generally have a lower breast cancer risk than do others.

    By Nathan Seppa
  3. Health & Medicine

    Hormone wards off immune cells in womb

    A hormone known for its involvement in the brain's response to stress also plays a key role in shielding the developing embryo from its mother's immune system.