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Health & MedicineUnder very rare conditions, Alzheimer’s disease may be transmitted
Alzheimer’s isn’t contagious. But contaminated growth hormone injections caused early-onset Alzheimer’s in some recipients, a new study suggests.
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HumansHere’s why COVID-19 isn’t seasonal so far
Human immunity and behavior may be more important than weather for driving seasonality when it comes to COVID-19.
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ClimateCold, dry snaps accompanied three plagues that struck the Roman Empire
New climate data for ancient Italy point to temperature and rainfall influences on past infectious disease outbreaks.
By Bruce Bower -
AnimalsWhat parrots can teach us about human intelligence
By studying the brains and behaviors of parrots, scientists hope to learn more about how humanlike intelligence evolves.