Regina Barber and Emily Kwong of NPR's Short Wave discuss an Earth-sized exoplanet, how ant colonies deal with disease and a possible link between volcanoes and the Black Death.

On this week's episode of Sources & Methods, NPR's Mary Louise Kelly talks to correspondents Greg Myre and Eleanor Beardsley about the future of the U.S. alliance with Europe under President Trump.

New court documents reveal a list of nearly 200 words or phrases the Trump administration told Head Start programs it does not want to see in their funding requests.