Fossil and genetic evidence indicates tooth enamel originated in the scales of ancient fish.

William Paul, the National Institutes of Health’s Laboratory of Immunology chief, passed away at age 79.

Several reports offer an inside look into the stem-cell research controversy.

DNA sequencing reveals personalized microbe communities in the air surrounding participants in a small study.

This year’s awards honor research on bee stings, appendicitis, kissing, and more.

This year’s honors go to researchers who mapped human populations, showed spots to cats, and offered children marshmallows to examine the kids’ patience and self-control.

The makeup of an individual’s microbiome correlates with genetic variation in immunity-related pathways, a study shows.

A genetic predisposition toward learning poorly from negative outcomes may influence behaviors leading to weight gain, a study shows.

The Pew Research Center finds substantial differences in US adults’ knowledge of physical science.

Improvements in multiple sclerosis symptoms correlate with higher levels of the sleep hormone, a study finds.

Pneumonic plague last month claimed 10 lives in 13 days, the World Health Organization reports.

Latest study puts the total number of trees on Earth at 3 trillion, well above previous estimates.