As life-preserving medical technology advanced in the second half of the 20th century, doctors and families were faced with a thorny decision, one with weighty legal and moral implications: How should ...

Astronomers are proposing a new, more quantitative definition of what makes a planet. The new definition looks more directly at the object's mass — but it would still leave Pluto out of the running.

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U.S. millennials are rejecting suburbia and moving back to the city. That was a prevailing idea in 2019, when I started as the social sciences reporter at Science News. But when I began digging into a ...