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You might know Ken Jennings as the Jeopardy! genius-turned host. But he's also an author, and a guy who really wants to know stuff.

The rebellious leader of the Wagner mercenary group said he had ordered his troops back to base, but analysts say the serious challenge to the Russian president will diminish his authority.

Living near parks can boost health. But low-income communities of color often have less access than their wealthier, white counterparts. One project aims to change that by revamping schoolyards.

NPR's Miles Parks talks to Mark Cancian, a retired Marine colonel, about Ukraine's counteroffensive against Russian forces.

Sen. Hillary Clinton and Sen. Barack Obama sparred Monday night at a Democratic debate in Myrtle Beach, S.C. Each accused the other of deliberately distorting the truth for political gain.

Democratic presidential candidates Barack Obama and Hillary Clinton last night met for their final debate before four primaries on March 4. They battled it out on topics including NAFTA, health care and Iraq. Clinton faces pressure to win big in Texas and Ohio in order to keep her presidential hopes alive.

There's already a huge demand for existing weight-loss drugs, so the new medication is highly anticipated. Obesity affects an estimated 650 million adults globally.

Tech companies are in a race to roll out AI chatbots and other tools. As technology gets better at faking reality, there are big questions over how to regulate it.

Republican presidential candidate John McCain is advocating a gas tax moratorium between Memorial Day and Labor Day to help ease the burden of high gas prices. But how would a gas tax holiday work? And would it help? Leonard Burman, director of the Tax Policy Center, a non-partisan think tank, talks with Melissa Block.

New research suggests silage has been overlooked as a substantial producer of nitrous oxide. A team at Kansas State University figured out why – and a potential way to tackle the problem.