In 2016, NASA launched a spacecraft to do something rarely attempted before: Collect space rocks from a potentially dangerous asteroid. The mission, named OSIRIS-REx, was successful. Tuesday, scientists opened a sealed canister containing the samples from the asteroid Bennu. Science correspondent Nell Greenfieledboyce talks to host Regina G. Barber about the mission's close calls and what NASA might learn from these space rocks that are older than our planet. Listen to Short Wave on Spotify, Apple Podcasts and Google Podcasts.Have a space mystery? Send us your questions to [email protected].

Ever had an itch you can't scratch? It can be maddening. And even though itch has a purpose — it's one of our bodies' alert systems — it can also go very wrong. Dermatologist Dr. Shawn Kwatra talks to host Regina G. Barber about the science of why and how we get itchy, the mysteries behind chronic itch and how his own experience with eczema, hives and seasonal allergies helps him connect with his patients.

Today on the show, All Things Considered co-host Mary Louise Kelly joins Regina G. Barber and Maria Godoy for our bi-weekly science roundup. They talk through some of the latest eye-catching science news, including the percussion-intensive mating life of cockatoos, what pink diamonds today tell us about the breakup of the ancient supercontinent Nuna and the latest on the Nipah outbreak in India.

The last several decades have taken a toll on the oceans: Some fish populations are collapsing, plastic is an increasing problem and climate change is leading to coral bleaching — as well as a host of other problems. But marine biologist and World Economic Forum programme lead Alfredo Giron says there's room to hope for the seas. He works to create systems that governments and the fishing industry can use to make sure fishing is legal and sustainable so oceans thrive for years to come. In this encore episode, he talks to host Aaron Scott about his work and how managing the ocean is a lot about managing people.We spoke to Alfredo Giron about his research and thoughts, the episode is not meant to reflect the World Economic Forum's positions.Have questions about the world around you? Email us at [email protected].

We're entering a new era of astrophysics. The James Webb Space Telescope is helping scientists test existing ideas and models of how the universe was created—on a whole new level. This telescope is sending back images of galaxies forming under a billion years after the Big Bang—way earlier than astronomers had previously expected. Not only that, scientists had anticipated that later—but still very early—galaxies would be small, barely formed blobs; instead, the galaxies in these images have spiral arms. So, today's show is all about GALACTIC CONTROVERSY! Computational astrophysicist Jorge Moreno talks with fellow astronomer and Short Wave's Scientist in Residence Regina G. Barber about how these new findings are stirring up controversy in the scientific community and the lessons we can learn from galaxies. Questions or controversies? Email us at [email protected].