What researchers are learning as they drill into Antarctica's 'Doomsday Glacier'

For the first time in more than half a century, there are no limits on the world's two largest atomic arsenals. The sole remaining nuclear arms treaty in the world, known as New START, is expiring between the U.S. and Russia, and arms control advocates fear a new arms race. Nick Schifrin reports. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

As the New START nuclear arms treaty between the United States and Russia expires, there is debate over whether the U.S. should extend the agreement or walk away. For two perspectives on that debate, Nick Schifrin speaks with Rose Gottemoeller, who was chief U.S. negotiator for the treaty during the Obama administration, and nuclear weapons and national security expert Frank Miller. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

In our news wrap Tuesday, the U.S. military says it shot down an Iranian drone in the Arabian Sea, more Palestinians gathered at the Rafah crossing on day two of its reopening, Russia renewed its attacks on Ukrainian energy targets, Trump said he's seeking $1 billion in damages from Harvard University, and Disney named Josh D'Amaro as its new CEO. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

Two presidents known for their fiery rhetoric against each other met Tuesday in the Oval Office and apparently put their acrimony behind them. Colombia's President Gustavo Petro has long been a critic of President Donald Trump and the U.S. itself, but Trump this afternoon praised Petro and did not repeat previous threats of military action. Nick Schifrin reports. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

The Olympics are here. Sports journalist Christine Brennan talks with Amna Nawaz about covering 22 consecutive Olympic Games, big moments in Olympic history and the sports and athletes to watch this year. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

For the first time in more than a year and a half, Gaza has a border open to the outside world. But Monday's reopening of the Rafah crossing with Egypt was limited, and comes after a deadly weekend in Gaza. Nick Schifrin reports. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

Elizabeth Tsurkov, a Russian-Israeli doctoral student at Princeton University, was conducting research in Baghdad in 2023 when she was kidnapped by an Iran-linked militia and held in captivity for more than 900 days. Her release last September followed a high-stakes international push. Amna Nawaz speaks with Tsurkov for her first American television interview. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

Iran is on notice as one of the U.S. military's largest aircraft carriers arrives in the Middle East after thousands of protesters were killed in a brutal crackdown. How vulnerable is the regime? And what are President Trump's options if he chooses to enforce his red line? Compass Points moderator Nick Schifrin discusses that with Firas Maksad, Vali Nasr, Behnam Ben Taleblu and Robin Wright. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

Trade deals around the world are being negotiated, signed and celebrated without the U.S. World leaders are looking to other sources of economic partnership as turbulent tariff policies, harsh rhetoric and unpredictable social media posts from President Trump push allies to the edge. Nick Schifrin reports. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy

An expedition to Antarctica has brought scientists and researchers to the widest glacier on Earth. The Thwaites Glacier is nicknamed the Doomsday Glacier because of its potential impact on sea levels if ice continues to melt. Miles O'Brien reports on the work to drill into the ice to record temperatures and understand the impact of climate change. It's part of our series, Tipping Point. PBS News is supported by - https://www.pbs.org/newshour/about/funders. Hosted on Acast. See acast.com/privacy