Salmonella is getting really good at antibiotic resistance. And it's moved beyond small children and the elderly to affect otherwise healthy adults, too.

A natural chemical may offer a way to vaccinate tomato plants and boost defenses against a pest that makes their leaves shrivel up and die.

"Our grandmas have always been asking us, 'If you're so smart, why haven't you come up with a cure for the common cold?' Now we have a new way to do that."

Invasive pests kill so many trees each year, they cut the carbon storage of forests by the equivalent of emissions from 5 million cars.

Research with roundworms shows a direct link between a diet lacking B12 and an increased risk of infection from two deadly pathogens.