In the cannabis industry, the chemistry lab meets agriculture. A cannabis product called Delta-8 has been popping up in smoke shops, CBD shops and even gas stations.

Dr. Katelyn Kesheimer, a researcher at Auburn University and the Alabama Cooperative Extension System, joins the show to demystify Delta-8. In this encore episode, we'll learn what it's made of, where it comes from, why it's so popular, and why science and the federal government are falling so far behind the cannabis industry.

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A judge said the rule exceeded the Centers for Disease Control's power, raising questions about how the agency can enforce public health rules in future crises. The Biden administration, so far, has not committed to an appeal of the ruling.

This episode: White House correspondent Scott Detrow, White House correspondent Tamara Keith, and transportation correspondent David Schaper.

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Salt has such a rich history that it was once (and is perhaps still) a sign of wealth. In this latest installment of our series on flavor and taste, "Taste Buddies," Scientist-in-Residence Regina G. Barber goes on a salty flavor journey with scientist Julie Yu. Along the way, Julie explains salt's essential role in our daily lives and how it affects our perception of food.

Follow Regina on Twitter @ScienceRegina. Email Short Wave at [email protected].

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And you might not have to go to Iowa in order to be the Democrats' presidential nominee anymore: the party is looking to reshape its primary calendar so the earliest states better represent the racial makeup of its voters.

This episode: White House correspondent Tamara Keith, political reporter Barbara Sprunt, and senior political editor and correspondent Domenico Montanaro.

Support the show and unlock sponsor-free listening with a subscription to The NPR Politics Podcast Plus. Learn more at plus.npr.org/politics

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A recent study found that working surge after surge in the pandemic, a majority of American health care workers experienced psychiatric symptoms — including depression and thoughts of suicide. And yet, mental health correspondent Rhitu Chatterjee found that very few got help for these symptoms.

If you or someone you know may be considering suicide, call the National Suicide Prevention Lifeline at 1-800-273-8255. Or text the word home to 741741.

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Sarah Palin, whose 2008 turn as John McCain's running mate presaged the Republican Party's evolution, is reentering the political arena with a bid to represent her home state of Alaska in the House of Representatives.

And in the contentous race to serve as the Republican Senate candidate in Pennsylvania, TV personality Mehmet Oz secured Donald Trump's coveted endorsement against Dave McCormick, a fifth-generation resident of the state with a more othodox politcial resume. Will it matter to voters there?

This episode: White House correspondent Asma Khalid, acting congressional correspondent Deirdre Walsh, national political correspondent Don Gonyea, and Alaska Public Media correspondent Liz Ruskin.

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Climate change poses an existential threat to the ski industry. A warmer climate means less snow and less now menas a shorter season for snowboarders and skiiers. NPR correspondent Kirk Siegler first covered the issue 15 years ago as local station reporter in Aspen. Now he returns to that world-renowned destination and tells Short Wave co-host Aaron Scott about one resort's efforts to push the nation toward clean energy while it continues catering to the carbon-generating, jet-set crowd.

Check out Kirk's full All Things Considered story here: n.pr/3rse2xP

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In Borodyanka, northwest of Kyiv, Natasha Romanenko lived in her root cellar for a month to avoid Russian soldiers. In the final days of the occupation, Natasha says she ventured out to milk her cow when she was briefly held at gunpoint by a Russian soldier who accused her of scouting Russian troop locations.

When Russian forces invaded and occupied her town, according to Ukrainian officials, Russia targeted civilian areas and left hundreds missing. Now, President Biden is accusing Putin and his forces of war crimes — including genocide.

This episode: congressional correspondent Susan Davis, White House correspondent Scott Detrow, and senior political editor and correspondent Ron Elving.

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Ranalda Tsosie grew up in the Navajo Nation, close to a number of abandoned uranium mines. The uranium from those mines leached into the groundwater, contaminating some of the unregulated wells that Ranalda and many others relied on for cooking, cleaning and drinking water. Today on the show, Ranalda talks to host Aaron Scott about her path to becoming an environmental chemist to study the extent of contamination in her home community using a blend of western and Diné science methods.

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There are 35 Senate elections happening this November and although Republicans are defending 21 incumbents to Democrats' 14, they still appear poised to take control as Biden's sagging approval rating jeopardizes his party's narrow control of the chamber.

This episode: congressional correspondent Susan Davis, congressional correspondent Kelsey Snell, and senior political editor and correspondent Domenico Montanaro.

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