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In the 1966 film "Fantastic Voyage," medical personnel board a submarine that shrinks to microscopic size and enters the bloodstream of a wounded diplomat to save his life.

Researchers at MIT have figured out how to grow "humanized" livers inside of mice--so the little critters could soon accurately predict how our livers will respond to drugs. Mice are a boon to biomedical research; they can often predict how humans will react to certain conditions, and not too many people get upset if they die from an overdose of toxic chemicals. But mice aren't as useful in pharmaceutical research because their livers react to drugs differently than human livers

At six hospitals in Alabama, an avoidable bacterial infection got into the bloodstream of 19 patients, possibly causing the death of nine. Mark Strassmann reports on the state's new outbreak of so-called "superbugs."

Weight loss may have an unwanted side effect, according to a new study in the journal Nature: It may send a flood of environmental pollutants into the bloodstream.