The history of life stretches back untold eons. Today, there is a staggering array of organisms on Earth, with more species being discovered every year. The complexity of life, from the smallest ...

What makes a human body? According to researchers, human cells tell but half the story. The other half involves the myriad of microorganisms that make up the microbiota — “alien” environments all over ...

The "hygiene hypothesis" suggests exposure to diverse types of microbes may protect against developing diseases caused by allergens, but a new Cornell University study in mice reveals that adults' ...