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Phytoplankton are tiny ocean organisms that naturally sequester carbon, like plants on land.

President Trump wants one federal set of rules for artificial intelligence — and wants to limit the ability of states to design their own AI regulations.

President Trump made a similar proposal in his first term, but after facing political pushback, reversed himself and expanded a drilling ban.

The pool carries as much water as six Olympic-size swimming pools. Beneath the surface, divers can explore an underwater "abandoned" city with apartments and an arcade.

Some swing voters supported Trump's immigration crackdown, while others said his tactics have caused chaos and gone too far.

Investigators say zoo patrons and staff were not in danger and that the threat was unsubstantiated.

The ceremony starts at 8 p.m. ET.

An overblown immune response could be killing a portion of the sick, and some doctors think that new treatments being tested could help at least some of those patients.

There are 31 House Republicans leaving their seats open this fall. The last time a party had nearly that many retirements during a midterm year was when Democrats lost control of Congress in 1994.

The wife of GOP presidential candidate Mitt Romney has overcome serious illness and a severe aversion to politics to campaign for her husband. Ann Romney is now passionate about her role promoting and protecting her husband on the campaign trail.