Take a road trip with us this summer as we revisit one of America’s most iconic landscapes: the Grand Canyon. This episode originally aired in 2019 to commemorate the 100th anniversary of the Grand Canyon’s designation as a national park. In this episode, host Dan LeDuc explores the beauty and geological history of this natural wonder with Wayne Ranney, a geologist who has spent his career studying the canyon.

In this episode, acclaimed documentarian Ken Burns offers us a look into his dynamic creative process and shares what inspires him to create powerful, enduring narratives of iconic historical figures and periods.

Since this episode originally aired in 2020, Burns has captivated audiences with documentaries on Ernest Hemingway, Muhammad Ali, Benjamin Franklin, the U.S. and the Holocaust, and the American buffalo as well as Burns’ first non-American figure and topic: Leonardo da Vinci. This fall, he will release a new series on PBS about the American Revolution and how the nation’s founding turned the world upside down.

This summer, we’re taking another look at one of the peskiest and deadliest insects on the planet: the mosquito. Millions of people are infected each year by diseases transmitted through mosquito bites, such as dengue fever, yellow fever, and malaria. In this episode, which originally aired in 2019, mosquito expert Carolyn “Lindy” McBride, a 2015 Pew biomedical scholar, shares the science behind why you may be more susceptible than other people to their bites.

As artificial intelligence grows in popularity, new data centers must accommodate the systems’ enormous need for energy. At the same time, household energy usage is rising throughout the United States. These increasing demands for electricity are stressing our nation’s aging electric grid.

In this episode of “After the Fact,” we travel to Houston—the epicenter of the U.S. power industry—to talk with experts, journalists, and electricity providers about why investments in modernizing the grid are necessary for preventing higher energy bills for consumers, or worse, blackouts that leave communities in the dark. We also explore how innovative solutions such as tapping into battery storage and “microgrids” could connect nearly 2,600 gigawatts of alternative energy capacity to the grid, which would double the nation’s available power supply.

Because of their massive size, blue whales are known as the ocean’s “gentle giants.” They are vital to the ocean ecosystem, but their numbers are declining. In this episode, 2016 Pew marine fellow Dr. Asha de Vos unpacks the significance of blue whales to our ocean’s health and how effects from human activity, such as increased shipping and the whale-watching industry, influence the blue whale’s population and migratory pattern.

Since this episode first aired in 2019, de Vos has continued conservation efforts through her organization, Oceanswell, and has advanced research on the effects of plastic pollution in Sri Lanka.

Have you tried to figure out whether the fish you eat is sustainably sourced? At least 1 in 5 fish caught in the global ocean is a product of illegal, unreported, and unregulated fishing—one of the main threats to the health of the ocean.

In this episode, part of our “From Lab to Life” series, we hear from Grantly Galland, who supports The Pew Charitable Trusts’ work on fisheries around the world. Grant tells us about his previous career as a fish biologist and researcher and how he traded in his wetsuit for a business suit to support policies leading to more sustainable fish stocks and to protect the marine environment from overfishing.

Each year, The Pew Charitable Trusts releases the “State of the City” report, which offers a data-rich snapshot of Pew’s hometown, Philadelphia. In this episode, Katie Martin, who leads Pew’s Philadelphia research and policy initiative, breaks down the highlights from the 2025 edition. She discusses the city’s successes, such as the decrease in poverty—at 20.3%, it’s the lowest it’s been in more than two decades—and its ongoing challenges, including the decline in homeownership, and how this troubling trend impacts Philadelphia’s ranking as a city of homeowners.

According to Pew Research Center, 55% of U.S. parents report being extremely or very concerned about the mental health of teens today. And several factors are driving that concern: increased influence of technology and social media, lingering effects of the pandemic, and social pressures like extracurricular activities and academic performance. Substance use is also linked with mental health and is occurring at younger ages with a rise in youth overdoses.

Mental health wellness and prevention programs from previous generations, some of which are still used today, have been ineffective or even counterproductive. So, what strategies actually work? In this episode of “After the Fact,” psychologists Obari Adéye Cartman and Sharon Hoover, as well as Pew’s Jessica Roark, discuss how to improve youth mental health programs and address substance use.

If you or someone you know needs help with substance use, visit www.findtreatment.gov.