The Respiratory System
In tests of lung function, men deemed more angry and hostile couldn't blow as much air out as others.
Soon, seemingly healthy smokers could inhale the gas in a new MRI technique to explore early signs of emphysema and asthma.
Shrinking their hearts and livers helps Arabian sand gazelles reduce water lost from breathing.
The virus infects peoples' lungs, but too deeply to be coughed or sneezed at another potential victim.
The spread of disease among otters, manatees and sea lions could be an early warning to humans.
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