We now share the planet with six billion of our fellow Earthlings. And we're spread across roughly 200 nations. Those of us near the top, however, are paying a price late in life.
In another boost for fish oil, a study has found it enhances the function of B cells, which can benefit immunocompromised individuals.
Seniors' apparent immunity from swine flu could indicate that the human population, as a whole, has a preexisting immunity to H1N1. Such thinking would help explain why H1N1 symptoms have been generally mild, researchers said Wednesday.