Humans
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Brain
Explainer: Our bodies’ internal clocks
Biological clocks determine hunger, sleepiness and other daily rhythms.
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Health & Medicine
Flu in the air
Germs tiny enough to pass through surgical masks may cause half of all cases.
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Health & Medicine
An itch switch
Scientists identify a chemical that helps the brain know where to scratch.
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Health & Medicine
Wanted: ‘Smart’ cleaners
Active surfaces will — on their own — help remove everything from insects and germs to poisons.
By Roberta Kwok -
Chemistry
A penny for your health?
Copper is best known as the reddish metal used to make pennies, electrical wiring and weather vanes. But two teen scientists think copper should find its way into medical settings as well. Their data suggest the metal — in bandages or on surfaces — could play a major role in killing some types of bacteria responsible for serious infections.
By Sid Perkins -
Health & Medicine
Killer-flu update
Infection that recently developed in China shows signs of being easy to spread and hard to kill.
By Janet Raloff -
Chemistry
New bag keeps food fresh longer
Invention harnesses oxygen-trapping power of iron.
By Sid Perkins -
Health & Medicine
Fuzzy future
Kids may suffer impaired vision from spending too little time outdoors, studies suggest.
By Nathan Seppa -
Archaeology
American cannibals
Skeletal remains of a Jamestown teen show signs of cannibalism in colonial America, new data show. The girl’s skull provides the first concrete support for historical accounts that some starving colonists had resorted to eating the flesh of others.
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Health & Medicine
Inspired medical research
Teens make real advances in biomedical science.
By Kellyn Betts