Short Wave

What better time to contemplate the conundrum that is zero than the start of a new year? Zero is a fairly new concept in human history and even more recent as a number. It wasn't until around the 7th century that zero was used as a number. That's when it showed up in the records of Indian mathematicians. Since then, zero has, at times, been met with some fear — at one point the city of Florence, Italy banned the number.Today, scientists seek to understand how much humans truly comprehend zero — and why it seems to be different from other numbers. That's how we ended up talking to science writer Yasemin Saplakoglu in this encore episode about the neuroscience of this number that means nothing.Read more of Yasemin's reporting on zero for Quanta Magazine. Plus, check out our episode on why big numbers break our brains.Interested in more math episodes? Let us know what kind of stories you want to hear from us in 2026 by emailing [email protected]!Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

Science in the United States took some big hits this year. The Trump Administration disrupted federal funding for all kinds of scientific pursuits. Administration officials say those changes were a step towards reinvigorating federal agencies like the National Institutes of Health. But many scientists disagree. NPR health and science correspondents Rob Stein and Katia Riddle chat with host Emily Kwong about what these cuts could mean for the future of science.Interested in more stories on the future of science? Email us your question at [email protected] to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

Gen Z and younger millennials are generally the most climate literate generations. As an age cohort that started learning about climate change in school, they're worried about how to plan for their future jobs, houses and, yes, kids. With climate-related disasters and global warming likely to worsen, climate anxiety is giving way to reproductive anxiety. So, what do experts say about how to navigate the kid question?On this encore episode of Nature Quest, Short Wave speaks to Alessandra Ram, a journalist covering climate change, who just had a kid. We get into the future she sees for her newborn daughter and ask, how do we raise the next generation in a way that's good for the planet?Here are the resources recommended by the experts we interviewed for this story:Action Tools and Community ResourcesThe High-Impact Climate Action Guide by Kimberly A. NicholasThe Climate Mental Health Network and Climate Emotions WheelThe Climate Café® Hub - for finding a local groupBooks and Research PapersClimate Anxiety and the Kid Question: Deciding Whether to Have Children in an Uncertain Future, by Jade S. SasserParenting in a Changing Climate: Tools for cultivating resilience, taking action, and practicing hope in the face of climate change, by Elizabeth BechardUnder the Sky We Make: How to Be Human in a Warming World, by Kimberly A. NicholasThe role of high-socioeconomic-status people in locking in or rapidly reducing energy-driven greenhouse gas emissions, Nielsen, K.S., Nicholas, K.A., Creutzig, F. et al. Got a question about changes in your local environment? Send a voice memo to [email protected] with your name, where you live and your question. You might make it into our next Nature Quest episode!Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

Kratom and 7-OH products are available in many smoke shops. But earlier this year, the FDA recommended certain 7-OH products be scheduled alongside opioids. This isn’t the first time kratom has come under scrutiny. Nearly a decade ago, the DEA wanted to make certain active ingredients in kratom controlled substances. Meaning products would go from being widely available to highly restricted. After a massive wave of protest, the DEA decided not to move forward. Producer Rachel Carlson joins host Emily Kwong to talk about what could happen this time around, and what scientists know – and don’t know – about kratom and 7-OH. Interested in more of the science behind drugs and supplements? Email us your question at [email protected] to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

Scientists in the Arctic are catching the exhaled breaths of whales to better understand their health. How? Drones. Whales breathe through their blowholes, which are the equivalent of nostrils on their heads. By studying the microbes in exhaled whale breaths, scientists are piecing together how deadly diseases spread in whale populations. Host Emily Kwong and producer Berly McCoy talk to All Things Considered host Juana Summers about what scientists can do with this information, from reducing stress on whales and monitoring ocean health to warning people who could be in close proximity to whales carrying zoonotic diseases. Interested in more science on charismatic megafauna? Email us your question at [email protected] to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy