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NASA's Artemis Moon mission was supposed to launch Monday. But it was delayed due to a problem one of the rocket engines. When it launches, it will be a giant step towards sending humans back to the moon. We're eager to know: What leaps in scientific knowledge will be gained?It's a question planted in our minds by the scientist Hal Walker, who led an experiment during the first lunar landing half a century ago. The goal: Beam a laser at the moon. This encore episode, Scientist in Residence Regina G. Barber talks to host Aaron Scott about the Lunar Laser Ranging experiment — and how shooting that laser helped us better understand one of Einstein's theories.Follow Aaron on Twitter @AaronScottNPR and Regina @ScienceRegina. Reach the show by beaming an email to ShortWave@NPR.org.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

People experiencing a mental health crisis have a new way to reach out for help in the U.S. — calling or texting the numbers 9-8-8. Today, health correspondent Rhitu Chatterjee joins Scientist in Residence Regina G. Barber to talk about how the hotline works, the U.S. mental health system and what this alternative to 911 means for people in crisis.Further Reading:- The new 988 mental health hotline is live. Here's what to know- Social Media Posts Criticize the 988 Suicide Hotline for Calling Police. Here's What You Need to KnowBelow is a non-comprehensive list of other hotlines and resources from our colleague Aneri Pattani at Kaiser Health News. Some resources may geographically limit services.- BlackLine is a hotline geared toward the Black, Black LGBTQ+, brown, Native, and Muslim communities- Kiva Centers offers daily online peer support groups- M.H. First Oakland and M.H. First Sacramento operate during select weekend hours in the California cities of Oakland and Sacramento- Peer Support Space hosts virtual peer support groups twice a day Monday through Saturday- Project LETS provides support by text for urgent issues that involve involuntary hospitalization- Samaritans of New York is a hotline based in New York City- Trans Lifeline is a hotline for trans and questioning individuals- Wildflower Alliance has a peer support line and online support groups focused on suicide preventionFollow Short Wave on Twitter @NPRShortWave. You can email us at ShortWave@NPR.org.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

In a crater at the top of a dormant volcano lies a place so quiet, the ambient sound is right near the threshold of human hearing. Visitors to the crater say they can hear their own heartbeats. This spot, in Haleakalā National Park, has been nicknamed the "quietest place on Earth."Getting there is no small feat--the ascent involves hiking upward through five different climate zones. But the reward is an experience of natural silence that is increasingly difficult to find.Conservationists, park scientists, and communities all over the United States are working to conserve their pristine soundscapes while noise pollution from planes, vehicles, and other human sources increases. Today, Regina G Barber talks with producer Margaret Cirino about the history, culture, and sound of the Haleakalā crater, and why it should matter to all of us.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy