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Donald Trump is officially running again, trying to avenge his loss to Joe Biden, even as Trump still refuses to admit he lost. Trump's push to overturn the 2020 outcome helped spark an insurrection.

Paul Salopek discusses his journey walking around the globe.

Learn more about our planet’s Hothouse and Icehouse climates.

Appraisal: André Servant Mort d'Henri IV Oil, ca. 1850

Professor Melvyn Leffler joins the show.

N.Y., D.C. on Alert Amid Possible Threat Timed to 9/11 Anniversary

D.C., N.Y. on Alert Over 'Credible' Terror Threat Around 9/11 Anniversary

Bloomberg Could Buy the World a Coke, but He'd Make It a Small

What we know about Iranian attacks on U.S. bases in Iraq

Artificial intelligence is used to find out what some carbonized Herculaneum scrolls say.