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  1. For some heart patients, days are numbered

    Cardiac deaths among Chinese and Japanese residents of the United States peak on the fourth day of each month, possibly due to psychological stress from their widespread belief that the number 4 is linked to death.

    By Bruce Bower
  2. Ecosystems

    Mistletoe, of all things, helps juniper trees

    A mistletoe that grows on junipers may do the trees a favor by attracting birds that spread the junipers' seeds.

    By Susan Milius
  3. Earth

    It’s bottoms up for iron at sea’s surface

    Sediments drilled from the seafloor off Antarctica suggest that the dissolved iron in surface waters that fuels much of the region's biological productivity comes from upwelling deep water currents, not from dust blowing off the continents.