Sloths weren't always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense claws.Video above ...

SAO PAULO — Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons — and when startled, they brandished immense claws. For a long time ...

SAO PAULO -- Sloths weren't always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge -- up to 4 tons (3.6 metric tons) -- and when startled, they brandished immense claws.

Sloths were not always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to four tonnes — and when startled, they brandished immense claws. For a long time ...

After breathing in spores of a fungus called Histoplasma capsulatum, which was hidden within the bat poop, the men developed a pneumonia condition called histoplasmosis. One man, aged 59 ...

A species of black fungus at the site of the Chernoyl disaster has mutated to 'feed' on nuclear radiation that would be lethal to most life forms. In the early hours of April 26, 1986, one of the most ...

Nail fungus is a frustratingly common ailment — about 10% of people are expected to get it at some point in their lives — and it can be tough to address because medications have to penetrate ...