Add Yahoo as a preferred source to see more of our stories on Google. illustration of single-cell parasites floating through the bloodstream alongside blood cells illustration of single-cell parasites ...

Deep in the caves of Ireland, scientists have discovered a mind-altering parasite that takes control of spiders, forcing them to abandon their webs before ultimately meeting a gruesome end. This newly ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. In something straight out of HBO's hit zombie show The Last of Us, a ...

The brain is like a medieval castle perched on a cliff, protected on all sides by high walls, making it nearly impenetrable. Its shield is the blood-brain barrier, a layer of tightly connected cells ...

Parasite, zombie, leech—these words are often used to describe people in unkind ways. Many of us recoil when ticks, tapeworms, fleas, head lice or bed bugs are even mentioned. Coming across such ...