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Forest fires burn in Colombia amid record heat

At least 21 forest fires are burning in Colombia as it endures record temperatures, in some cases prompting wild animals to seek shelter in urban areas, authorities said Wednesday.

Study reveals how some bacterial infections become chronic

In the early 1900s, a cook named Mary Mallon, better known as "Typhoid Mary," spread Salmonella Typhi, the causative agent of typhoid fever, to dozens of her patrons even though she showed no symptoms. Many people today harbor ...

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