Short Wave

In 1999 hundreds of gray whales washed up along the west coast of North America. More in 2000. They lost an estimated 25% of their population. But then the whale population recovered and people moved on. Until it happened again in 2019. And 2020, and 2021. It’s still happening today. Host Regina G. Barber dives into this mystery with marine ecologist Joshua Stewart, who explains how scientists like himself solved it – and the tough questions that came up along the way. 

Check out our Sea Camp series and our limited run Sea Camp newsletter, featuring deep dives into research, cute critters and games!

Interested in more ocean mysteries? Email us your question at [email protected].

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Today, guest host Selena Simmons-Duffin is exploring a detail very personal to her: How the number of older brothers a person has can influence their sexuality.

Scientific research on sexuality has a dark history, with long-lasting harmful effects on queer communities. Much of the early research has also been debunked over time. But not this "fraternal birth order effect." The fact that a person's likelihood of being gay increases with each older brother has been found all over the world – from Turkey to North America, Brazil, the Netherlands and beyond. Today, Selena gets into all the details: What this effect is, how it's been studied and what it can (and can't) explain about sexuality.

Interested in the science of our closest relatives? Check out more stories in NPR's series on the Science of Siblings.

Email us at [email protected] — we'd love to hear from you.

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Paleontologists have often determined how old a dinosaur was by counting the growth rings in its bones. Just like with trees, it was thought that each ring corresponded to a single year of age. But researchers who studied crocodiles at an outdoor recreation center near Cape Town appear to have poked a hole in that approach. In the crocodiles, which are some of the closest living relatives of dinosaurs, there was more than one growth ring laid down per year. The results contribute to a growing debate over the best way to age animals.

Read more of freelance science reporter Ari Daniel’s story here.

Interested in more on the future of science? Email us your question at [email protected].

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Teens aren’t getting enough sleep! And a two-decade study suggests it’s getting worse. Scientists found that the number of high schoolers getting insufficient sleep — less than seven hours a night — has increased from 69% to 77%. The throughline? There wasn’t one. Teens had bad sleep habits across most demographics, including race, gender and grade level. The findings were published this week in the journal JAMA.

Interested in more science behind recent headlines? Email us your question at [email protected].

For more about earthquake science – and the Cascadia Fault in particular – check out our recent episode on the Pacific Northwest’s Big One.

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In his role as secretary of Health and Human Services, Robert F. Kennedy Jr. is changing how the United States approaches vaccines. But those changes aren’t limited to the United States. NPR global health correspondent Gabrielle Emanuel joins Short Wave to talk about two examples of how the global public health landscape may be shifting. First, the United States’ ultimatum to an international vaccine group. Second, the uncertain fate of a vaccine trial. Some researchers are calling the trial a “unique” opportunity, and others are calling it “unethical.” 

Read more of global health correspondent Gabrielle Emanuel’s work here.

Interested in more global health? Email us your question at [email protected].

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