Humans
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Animals
Explainer: Animals’ role in human disease
Wildlife, livestock and pets are the source of most germs that can sicken people
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Brain
Teen fighting may harm IQ
Blows to the head may explain these effects on the brain.
By Janet Raloff -
Brain
Nature resets body’s clock
After a week in the wild, people went to bed — and got up — earlier.
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Health & Medicine
Explainer: The teenage body clock
Around puberty, a change in the body clock of adolescents and teens makes it hard for them to fall asleep as early as they used to.
By Susan Gaidos -
Tech
Sniffing for cancer
New surgical tool offers surgeons speedier diagnosis of tissues that are cancerous.
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Health & Medicine
Cool Jobs: Sports science
From soccer teams to the balance beam, scientists help athletes perform their best.
By Helen Fields -
Health & Medicine
Explainer: What should I know about HIV and AIDS?
Here are some common myths and some less common facts.
By Bryn Nelson -
Life
Explainer: What is a stem cell?
Special cells have ability to turn into several different types
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Health & Medicine
Fat becomes a disease
Medical group decides it is time for doctors to view — and treat — obesity as a disease.
By Janet Raloff -
Health & Medicine
Infection time
Disease is more severe when it hits in the morning, at least in mice.