Detecting the acidity of the ocean with sound, the role of lead in human evolution, and how the universe ends
Science Magazine Podcast30 Loka 2025

Detecting the acidity of the ocean with sound, the role of lead in human evolution, and how the universe ends

First up on the podcast, increased carbon dioxide emissions sink more acidity into the ocean, but checking pH all over the world, up and down the water column, is incredibly challenging. Staff Writer Paul Voosen joins host Sarah Crespi to discuss a technique that takes advantage of how sound moves through the water to detect ocean acidification. Next on the show, we visit the lab of University of California San Diego professor Alysson Muotri at the Sanford Consortium, where he grows human brain organoids—multicellular structures that function like underdeveloped brains. Muotri used organoids to compare a protein that appears to be protective in human brains against the effects of lead toxicity with the archaic version of the protein that was present in our extinct cousins, like Denisovans and Neanderthals. His work suggests lead exposure differently affected our ancestors and our archaic cousins, possibly helping us survive to the present day. Finally, stay tuned for the last in our six-part series on books exploring the science of death. This month, host Angela Saini talks with astrophysicist Katie Mack about how the universe might end and her 2021 book The End of Everything: (Astrophysically Speaking). This week’s episode was produced with help from Podigy. Learn more about your ad choices. Visit megaphone.fm/adchoices

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Resolving the dispute over the speed of the expanding universe, and seeking new drug targets for cognitive dysfunction

Resolving the dispute over the speed of the expanding universe, and seeking new drug targets for cognitive dysfunction

First up on the podcast, a new path to calculating the Hubble constant. This value for the universe’s speed of expansion is typically determined in one of two ways, one favored by cosmologists, the ot...

2 Huhti 33min

Resurrection plants, Project Hail Mary, and the trouble with sycophantic AI

Resurrection plants, Project Hail Mary, and the trouble with sycophantic AI

First up on the podcast, Deputy News Editor Martin Enserink talks about so-called resurrection plants. These specialized plants can survive up to 95% water loss, whereas most plants struggle when thei...

26 Maalis 36min

Rethinking the peopling of the Americas, and the best ways to get groundwater back

Rethinking the peopling of the Americas, and the best ways to get groundwater back

First up on the podcast, we discuss a finding that’s likely to reignite debate over how humans first spread through the Americas. In the late 1990s, a site in southern Chile called Monte Verde forced ...

19 Maalis 33min

What Alaska’s eroding coastline says about Earth’s future, and how Yellowstone ravens use their smarts to find wolf kills

What Alaska’s eroding coastline says about Earth’s future, and how Yellowstone ravens use their smarts to find wolf kills

First up on the podcast, freelance journalist Evan Howell traveled to Cape Blossom, Alaska, where the receding coastline has revealed an ancient trove of glacial ice that may have survived for 350,000...

12 Maalis 42min

An alleged nuclear blast may reignite weapons testing, and who owns the Moon

An alleged nuclear blast may reignite weapons testing, and who owns the Moon

First up on the podcast, a peek into the roiling seas of U.S. science policy. ScienceInsider Editor Jocelyn Kaiser talks about shifting leadership at the National Science Foundation and the Cente...

5 Maalis 38min

Tropical birds’ ‘silent spring,’ and mapping people’s brains during surgery

Tropical birds’ ‘silent spring,’ and mapping people’s brains during surgery

First up on the podcast, producer Meagan Cantwell talks to Contributing Correspondent Warren Cornwall about his visit to Brazil, where he observed firsthand what it takes for researchers to understand...

26 Helmi 32min

Matching sounds to shapes, and stories from the AAAS annual meeting

Matching sounds to shapes, and stories from the AAAS annual meeting

First up on the podcast, Newsletter Editor Christie Wilcox, Associate Online News Editor Michael Greshko, and intern Perri Thaler share their experiences from the AAAS annual meeting in Phoenix. Chri...

19 Helmi 41min

Building better working dogs, and watching a black hole form

Building better working dogs, and watching a black hole form

First up on the podcast, more than half of all dogs going through service animal training don’t make it to graduation. Producer Kevin McLean journeys with Online News Editor David Grimm to Canine Comp...

12 Helmi 34min

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