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  1. Earth

    Protecting Baby: Calcium in pregnancy reduces lead exposure

    By taking calcium supplements during pregnancy, a mother can significantly reduce the lead exposure of her fetus.

    By Carrie Lock

  2. Glowing Trio under the Sea: Nitrogen fixer joins algae inside coral

    A coral that fluoresces orange appears to be the first ever found to contain a symbiotic microbe that converts nitrogen into a biologically useful form.

    By Susan Milius

  3. 19453

    I wonder if the growth rings appearing in dinosaur bones are analogous to those of trees, which are determined by the annual climatic cycle. Is it possible that the dinosaur rings were created on a different time cycle? James HendryFlorissant, Mo.