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  1. Space

    Martian stairs suggest predictable ancient climate

    Tilt in Mars' axis could have created stair-stepped rock formations long ago.

    By Ron Cowen
  2. Life

    Spanish Inquisition couldn’t quash Moorish, Jewish genes

    Finding suggests modern history, not just prehistory, can leave a strong mark on a region’s genetic signature.

    By Tina Hesman Saey
  3. Life

    Funny smell may have split bee species

    Among male bees that create their own perfume, a change in the sense of smell might mean a split in species.

    By Susan Milius
  4. Health & Medicine

    Men line up for circumcision in Africa

    But demand for the operation, shown to guard against HIV and other infections, exceeds availability.