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A new study looks at an unexpected force that played a critical role in shaping the lives of ancient humans.

Acting Attorney General Todd Blanche said he is immediately moving medical marijuana from Schedule I to Schedule III, which includes drugs like ketamine, Tylenol with codeine and anabolic steroids.

Analysis from political scientists Sara Mitchell of the University of Iowa and Peter Hanson of Grinnell College on statewide races, the latest fallout from the war with Iran and why some Republican Senators are quietly hoping for a Supreme Court retirement before the midterms.

Some degree programs could be eliminated at the state's public universities. A study shows Midwest residents don't typically test their well water for nitrates. And volunteers in northwest Iowa are coming together to support immigrants.

Tensions are rising in the Middle East as shaky ceasefire agreements between the U.S., Israel and Iran, and Lebanon and Israel, are tested. And, the Secretary of the Navy is out of the role.

President Trump said Thursday that Israel and Lebanon have agreed to extend their ceasefire for three weeks after the two sides met at the White House for a high-level negotiation.

After a year without data, the State Department released figures on PEPFAR, the program launched by George W. Bush and credited with saving millions of lives. How did Trump's aid cuts affect it?

President Trump has extended the ceasefire, but Iran says it's not enough if the naval blockade is still in place.

NPR's Michel Martin talks with Robert Harward, former deputy commander of Central Command, about U.S. Naval operations around the Strait of Hormuz and implications for the future of the war with Iran.

The AI models and chatbots that we interact with tend to affirm our feelings and viewpoints — more so than people do, with potentially worrisome consequences.