A class of toxic chemicals known as PFAS has made its way into food, soil, water and even most people's blood in America. In March, the EPA proposed the first regulatory standard limiting the quantity of PFAS in drinking water. Erin Bell, an environmental epidemiologist at the State University of New York at Albany, joins Ali Rogin to discuss these "forever chemicals" and our exposure to them. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

What we know about toxic 'forever chemicals' and how to reduce our exposure

For fossil hunters, the thrill is often in the hunt. For 9-year-old Molly Sampson, her prehistoric shark tooth discovery along a Maryland beach is considered the find of a lifetime. And the dinosaur footprint English archaeologist Marie Woods spotted has revealed a new dinosaur behavior. Ali Rogin details these recent fossil finds that are helping advance scientific knowledge. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

How amateur fossil finds translate into scientific discovery

Scientists warned that human-induced climate change is warming the planet to the point where it is causing irreversible damage in some parts of the world. The report was released by the United Nations Intergovernmental Panel on Climate Change. Climate Scientist Katharine Hayhoe of The Nature Conservancy joined Amna Nawaz to look at what can be done to change the direction the planet is headed. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

UN scientists warn drastic steps needed to prevent climate change catastrophe

The Great Atlantic Sargassum Belt, a 5,000-mile-long belt of seaweed weighing more than 11 million tons, is threatening to wreak havoc in the coastal waters and beaches of the Atlantic Ocean. It's so big that it can be seen from space, spanning the tropical Atlantic from West Africa to the Caribbean. Oceanographer Ajit Subramaniam joins John Yang to discuss. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

A 5,000-mile-long mass of seaweed is coming to shore. Here's what will happen

This Women's History Month, we're highlighting stories of women whose contributions have often been overlooked. Tonight, we look at the career of Chien-Shiung Wu, a 20th-century physicist who made indelible changes to her field. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

The career of Chien-Shiung Wu, the 'First Lady of Physics'

U.S. airports have seen an uptick in near-collisions involving commercial planes. The problem prompted the FAA to call for a safety summit, launching a review of standards and procedures to prevent catastrophe. Geoff Bennett reports on the close calls and discusses the possible factors with aviation correspondent Miles O'Brien.  PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

After near-collisions on airport runways, FAA calls for safety review

Delegates at the United Nations have agreed on a historic international treaty to protect biodiversity on the high seas, a deal years in the making. The agreement is critical to reaching another U.N. goal: protecting 30 percent of the ocean by 2030. Liz Karan with the Pew Charitable Trusts joins John Yang to discuss the negotiations. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Historic deal to protect ocean biodiversity reached at UN conference

This Women's History Month, we're highlighting stories of women whose accomplishments have often not received widespread attention. Today, we learn about NASA astronaut Ellen Ochoa, who became the first Hispanic woman to go to space in 1993.  PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

The story of Ellen Ochoa, the first Hispanic woman in space

Thanks to some unusual sunspot activity, the northern lights are putting on a show much farther south than usual, giving more people chances to catch a glimpse. From Norway to Scotland to Alaska, we look at some spectacular sights captured recently in the night skies. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Aurora borealis puts on a dazzling display in unusual places

It's almost official. Soy, almond and other plant-based drinks that call themselves milk can keep using that name, at least according to new draft guidelines released by the FDA last week. Stephanie Sy explores the debate. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

New FDA guidelines on milk spark disagreements between farmers and plant-based companies

Scientists researching the aftermath of California wildfires say they are finding evidence that climate change is accelerating the risk of disease spreading from animals to humans. Science correspondent Miles O'Brien reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Is climate change accelerating the risk of disease spreading from animals to humans?

In last week's State of the Union, President Biden reaffirmed his administration's commitment to get more electric vehicles in American driveways. It's estimated that half of all new vehicle sales will be EVs by 2030, but the industry still faces infrastructure hurdles, policy challenges and public misconceptions. Forbes senior transportation editor Alan Ohnsman joins William Brangham to discuss. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

The current hurdles to putting more electric vehicles on the road

Drew Lanham refers to himself as a 'rare bird.' The ornithologist, naturalist and writer says he believes conservation efforts must be a blending of rigorous science and evocative art. Lanham is among the new class of MacArthur Fellows, an honor often called 'The Genius Award.' Jeffrey Brown traveled to South Carolina to speak with Lanham for our arts and culture series, CANVAS. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Bird expert and poet Drew Lanham on how he's inspired by the natural world

Artificial intelligence has the potential to dramatically alter how we gather information, communicate and work. Experts are also raising questions about how it will affect governance and what it will mean for the future of our democracy. Bruce Schneier, a fellow at Harvard University's Berkman Klein Center for Internet and Society, joins William Brangham to discuss. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Security expert warns of AI tools' potential threat to democracy

This was an important week in the battle out west over water use. Seven states along the Colorado River basin were supposed to reach a collective agreement on how to use less water from an ever-shrinking river, but they failed to do so. William Brangham spoke with Rhett Larson for our series on water issues, Tipping Point. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Western states that rely on Colorado River fail to reach agreement on cutting consumption

Wednesday marks 20 years since the space shuttle Columbia disintegrated on its way home. The tragedy not only killed all seven astronauts on board but also was the beginning of the end for the space shuttle program and changed how we explore space now. Science correspondent Miles O'Brien spoke with retired astronaut and Senator Mark Kelly about the Columbia disaster. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

20 years later, Mark Kelly reflects on the space shuttle Columbia disaster

In our news wrap Saturday, tensions remain high after a 13-year-old Palestinian boy shot and wounded two people in Jerusalem, floodwaters are receding in Auckland, New Zealand after record-breaking rainfall, Pope Francis clarified his words after saying that being gay is a sin, Trump hit the campaign trail for his 2024 presidential bid, and the Challenger space shuttle exploded 37 years ago today. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

News Wrap: Tensions high after 2nd shooting in Jerusalem wounds 2

The demand for electric vehicles is surging in the U.S., sparked in part by the Biden administration's Inflation Reduction Act and the subsidies it offers. But a looming supply shortage of lithium threatens to stall the EV transition. Stephanie Sy traveled to California's Salton Sea where lithium deposits could help meet the country's energy needs and support an economically devastated region. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Salton Sea lithium deposits could help EV transition, support economically devastated area

In one of the great environmental success stories of our time, scientists say that a 35-year-old agreement has resulted in the steady and promising recovery of the Earth's ozone layer, a critical protective shield that blocks harmful ultraviolet radiation from the sun. Dr. Paul Newman, chief scientist for Earth sciences at NASA's Goddard Space Flight Center, joins William Brangham to discuss. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Earth's ozone layer continues to recover, scientists report

In the remote village of Ambler, Alaska, temperatures can fall to minus 60 degrees Fahrenheit in the winter, so heating the community is a big job. This past September, Ambler switched to a renewable energy option in an effort to go greener -- a change that also means a path toward a more sustainable economy for Alaska Native communities. Alaska Public Media's Elyssa Loughlin reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

PBS NewsHour - Science

PBS NewsHour - Science

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