Learn how the brain weighs emotional strain when deciding whether to seek information — or shut it out.

Learn more about “thirdhand smoke” and how it keeps polluting homes, and your lungs, long after smoking stops.

Learn how mapping gene-control switches in an ancient sea anemone reveals how identical DNA can produce many different cell ...

Learn why killer whales sometimes wear dead salmon on their heads, and what that might mean.

What's the size of the Milky Way galaxy? Learn how, depending on your definition, the size can change.