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President Donald Trump announced Tuesday he has decided to nominate Jared Isaacman to serve as his NASA administrator, months after withdrawing the tech billionaire's nomination because of concerns about his political leanings.

A Centers for Disease Control and Prevention webpage that previously stated "Vaccines do not cause autism" has been changed to cast doubt on the scientific research that supports the finding.

A major conflict has been over how much each basin must cut back their use of the overtapped river, to close the ever-growing gap between dwindling supply and ravenous demand.

Under President Trump, the U.S. has taken steps to roll back climate policies. Here are six significant changes.

A new pachycephalosaur, officially named Zavacephale rinpoche, was described in the journal Nature. The word rinpoche is Tibetan for "precious one" and refers to the domed skull.

The red pigments in some fall leaves have proven to be a puzzle for researchers who debate why leaves bother to go red.

A paleontologist was trying to locate the site of a famous 1908 discovery when a rancher in Wyoming shared an important clue.

A study points to a new concern about the effect that heat can have on young children.

Immigrants make up a significant proportion of all the country's doctors. New policies are making it harder and less appealing for foreign-born physicians to come to the U.S.

The 2025 selection follows its predecessors, "brain rot" from 2024, "rizz" from 2023 and "goblin mode" from 2022.