News
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Human immune signal sets off bacterial attack
A chemical secreted by immune cells when people are stressed or sick causes a common gut bacterium to go on the offensive against its host.
- Earth
Great river cycles carbon quickly
Some of the organic material carried to the sea by the Amazon is thousands of years old, but much of the carbon in carbon dioxide emanating from the river was stored in plants for less than a decade.
- Earth
What’s Gotten into Everybody? Survey of bodily contaminants finds encouraging declines and new exposures
The U.S. population's exposure to lead, secondhand smoke, and certain other harmful chemicals has trended downward, but some newly measured contaminants are present in a sizable fraction of the nation's residents, according to an updated report.
