Puerto Rico has — five years after Hurricane Maria killed thousands — again been hit by a devastating storm. Trump was broadly criticized for a mismanaged response; will President Biden prove more capable?

And House Republicans have unveiled the policy program they'll push should they retake the chamber, as is expected. The Commitment To America program is rooted in culture war issues and is accompanied by a promise to "conduct rigorous oversight" of the Biden administration.

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Dinosaurs ruled the earth for many millions of years, but only after a mass extinction took out most of their rivals. Just how that happened remains a mystery — sounds like a case for paleoclimatologist Celina Suarez! Suarez walks us through her scientific detective work, with a little help from her trusty sidekick, scientist-in-residence Regina G. Barber.

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A panel of judges from the Eleventh Circuit Court of Appeals allowed the Justice Department to resume reviewing classified documents seized at Mar-a-Lago without the supervision of a special master. Meanwhile, New York state attorney general Letitia James announced the filing of a $250 million civil suit against Trump and some of his children, alleging fraudulent business practices.

This episode: political reporter Deepa Shivaram, national justice correspondent Carrie Johnson, and reporter Andrea Bernstein.

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In the final episode of Short Wave's Summer Road Trip series exploring the science happening in national parks and public lands, Aaron talks to National Park Service Director Charles Sams, who recently issued new policy guidance to strengthen the ways the park service collaborates with American Indian and Alaska Native Tribes, the Native Hawaiian Community, and other indigenous peoples. It's part of a push across the federal government to increase the level of tribal co-stewardship over public lands. Aaron talks with Sams, the first Tribal citizen to head the agency, about how he hopes this will change the way parks are managed, how the parks are already incorporating Traditional Ecological Knowledge, and what national parkland meant to him growing up as a member of the Cayuse and Walla Walla tribes on the Umatilla Indian Reservation in eastern Oregon.

Listen to more episodes about all the amazing research taking place on public lands, where we hike up sky islands and crawl into caves in search of fantastical creatures, by visiting the series website: https://www.npr.org/series/1120432990/road-trip-short-wave

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President Biden's annual remarks before the United Nations General Assembly were designed to rally people at home and abroad to continue their support for the Ukrainian people. He also doubled-down on U.S. competition with China.

This episode: voting reporter Miles Parks, White House correspondent Franco Ordoñez, and diplomatic correspondent Michele Kelemen.

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The water advice is everywhere - how much to drink (8 cups a day - really?), what to drink, when to drink, and all its benefits. On this episode we produced with our colleagues at Life Kit, hosts Aaron Scott and Emily Kwong take some cherished hydration beliefs and get to the reality behind the science of hydration and the actual best ways to quench our thirst.

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President Biden told 60 Minutes that the pandemic is basically over. Hundreds of Americans are still dying every day, but most Americans are essentially living their lives as they were before the pandemic started. So how are public health experts reacting to the president's remarks? And what's the president's messaging goal?

This episode: political correspondent Susan Davis, science correspondent Rob Stein, and national political correspondent Mara Liasson.

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Nearly a decade ago, Karen Douthitt and her sisters June Ward and Susie Gilliam set out to learn why Alzheimer's disease was affecting so many of their family members. Since then, each sister has found out whether she carries a rare gene mutation that makes Alzheimer's inescapable. Jon Hamilton talks to Emily about the sisters and how all three have found ways to help scientists trying to develop treatments for the disease.

Thoughts or comments? Get in touch — we're on Twitter @NPRShortWave and on email at [email protected].

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Though both parties have agreed for decades that the U.S. immigration system is in dire need of reform, the optics of border-crossing migrants have become a red-meat campaign tactic for Republicans, precluding the possibility of compromise legislation. Recent moves by the governors of Florida and Texas have put the issue back in the spotlight.

This episode: White House correspondent Asma Khalid, immigration correspondent Joel Rose, and national political correspondent Mara Liasson.

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Last week, Lauren Sommer talked with Short Wave about the dangerous combination of heat and humidity in the era of climate change and how the heat index can sometimes miss the mark in warning people how hot it will feel. That reminded us of producer Thomas Lu's conversation about relative humidity with Maddie Sofia. He digs into why some meteorologists say it's important to pay attention to dew point temperature and how moisture in the air and temperature influence the way our body "feels" when we're outside. (Encore)

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