Biodiversity loss, global warming, pollution and the spread of invasive species are making infectious diseases more dangerous to organisms around the world.

The presidential candidate has faced previously undisclosed health issues, including a parasite that he said ate part of his brain.

Using powerful technologies, scientists found staggering amounts of lead and other toxic substances in the composer’s hair that may have come from wine, or other sources.

After being diagnosed when she was 23, she became determined to educate other young people about early detection.

People with two copies of the gene variant APOE4 are almost certain to get Alzheimer’s, say researchers, who proposed a framework under which such patients could be diagnosed years before symptoms.

A 12-year-old boy in the Washington, D.C., area faces months of procedures to remedy his disease. “I want to be cured,” he said.