The Smithsonian’s renovated fossil hall puts ancient dinosaurs and other creatures in context.
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The basic reproduction number, or "R naught," of measles shows how contagious the disease is compared with other pathogens.
Amateur astronomer images and satellite data are revealing what causes the strange atmospheric glow called STEVE.
Physicians are examining whether discussing shared health goals can bring vaccine-hesitant parents on board.
Measles is a global health threat. Snapshots of several countries show how stopping its spread depends on local conditions and beliefs.
The Southern Ocean’s ability to suck up much of the carbon that humans pump into the atmosphere is in question.