Science Friday Folgen

Sunscreen has been on the shelves of drugstores since the mid-1940s. And while new kinds of sunscreens have come out, some of the active ingredients in them have yet to be determined as safe and effective. A recent study conducted by the FDA showed that the active ingredients of four commercially available sunscreens were absorbed into the bloodstream—even days after a person stops using it. Ira talks to professor of dermatology and editor in chief of the Journal of the American Medical Association Dermatology Kanade Shinkai about what the next steps are for sunscreen testing and what consumers should do in the meantime. Often called the planet’s lungs, the trees of the Amazon rainforest suck up a quarter of Earth’s carbon and produce a fifth of the world’s oxygen. The National Institute for Space Research in Brazil has been using satellite images of tree cover to monitor the Amazon’s deforestation since the 1970s—and new data shows a potentially dangerous spike in deforestation. In the first seven months of 2019, the rainforest lost 50% more trees than during the same period last year. That spike in tree loss has coincided with Brazil’s new president, Jair Bolsanaro, taking office in January and slashing environmental protections. Bolsanaro even called the new data a lie. But climate scientists warn deforestation is pushing the Amazon rainforest to a tipping point that would disrupt both its ecosystem and the global climate. Ira talks to Carlos Nobre, a climate scientist at the University of Sao Paulo’s Institute of Advanced Studies, about the new data and why deforestation in the Amazon is so risky for the planet. When you think of algae, one of the first images that might come to mind is the green, fluffy stuff that takes over your fish tank when it needs cleaning, or maybe the ropy seaweed that washes up on the beach. But the diversity of the group of photosynthetic organisms is vast—ranging from small cyanobacteria to lichens to multicellular mats of seaweed. Author Ruth Kassinger calls algae “the most powerful organisms on the planet.” She talks about how this ancient group of organisms produces at least 50% of the oxygen on Earth, and how people are trying to harness algae as a food source, alternative fuel, and even a way to make cows burp less methane. Subscribe to this podcast. Follow our show on Instagram, TikTok, Facebook, and Bluesky @scifri and sign up for our newsletters. Got a science question that’s keeping you up at night? Call us: 877-472-4374 Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

Mauna Kea is the tallest mountain in Hawaii, towering over the Pacific at nearly 14,000 feet. That high altitude, combined with the mountain’s dry, still air and its extreme darkness at night, make it an ideal place for astronomy. There are already 13 observatories on the summit plateau. Now, astronomers want to build another, called the Thirty Meter Telescope, or TMT, which would become the largest visible-light telescope on the mountain.  But many native Hawaiians don’t want it there, for a multitude of reasons. Science Friday talked with Kawika Winter, a multidisciplinary ecologist at the Hawaii Institute of Marine Biology and the He'eia National Estuarine Research Reserve, who summed it up this way:  "The notion of pursuit of knowledge is an important one here. But is it pursuit of knowledge at all costs? Is it pursuit of knowledge at the expense of our humanity?  From the native Hawaiian perspective this is just the same thing that's happened before. It's preventing people from accessing sacred places. It's desecration of sacred places through construction. It's all of these issues, but this time it's for a ‘good reason.’ This time it's for science, this time it's for knowledge, so now it should be ok, right? But it's the same thing that's been happening for 200 years. It doesn't matter what the reason is. Engaging native Hawaiians is not a box to check off in the process. And you check it off at the end, say 'yeah, we checked with native Hawaiians.' That's not the proper way to engage in science in indigenous places. So we're trying to advocate for a different model for approaching science, and integrating native peoples, indigenous peoples, and indigenous cultures into the process. And that's how we can make sure the science we conduct doesn't come at the expense of our humanity."  Many native Hawaiians say the way this fight has been portrayed in the media—as Hawaiian culture versus science—is disrespectful of their culture, ignorant of their motives, and oblivious to the fact that science has long been an important part of traditional Hawaiian culture. Nearly a thousand scientists and astronomers have now signed an open letter in solidarity with those who would like to see a halt in construction.  When a baby human learns to talk, there’s a predictable pattern of learning: First, they listen to the language spoken around them, then they babble and try to make the same sounds, and then they eventually learn the motor skills to shape that babble into words and meaning. Researchers who study songbirds know this is also the process by which a baby male zebra finch learns the unique songs that as an adult he will use to mate and defend territory. The same holds true for canaries, nightingales, warblers, and beyond. And for many birds, like humans, the window where they learn their “language” best is a short one that closes early in life. In fact, bird song is studied closely as an analogy for human speech—an example of sophisticated brain machinery for learning that evolved separately in birds and humans.  Alaska governor Mike Dunleavy’s budget cuts to the University of Alaska total about $136 million, or roughly 41 percent of state support. As a result, the University of Alaska Board of Regents voted 8 to 3 to move towards consolidating the entire university system to a single accredited university. UA president Jim Johnsen says under any plan, it’s likely that the cuts will have a ripple effect on enrollment and research. He says both are avenues that could result in less money for the university as a whole. A task force has been put together to determine how to move forward with the single university model.   Subscribe to this podcast. Follow our show on Instagram, TikTok, Facebook, and Bluesky @scifri and sign up for our newsletters. Got a science question that’s keeping you up at night? Call us: 877-472-4374 Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

Have you ever tried to make your favorite rocky road flavored ice cream at home, but your chocolate ice cream turns out a little crunchier than you hoped? And your ribbons of marshmallow are more like frozen, sugary shards? Chemist Matt Hartings and ice cream maker Ben Van Leeuwen, co-founder of Van Leeuwen Artisan Ice Cream in New York City, talk about the science behind how milk, sugar, and eggs turn into your favorite frozen desserts. They’ll chat about the sweet science behind other frozen delights, too—like how the size of water crystals affect texture and how you can make a scoopable vegan ice cream.  Are you a fluent texter? Are you eloquent with your emoji? DOES WRITING IN ALL CAPS SOUND LIKE SCREAMING TO YOU? Maybe you’ve become accustomed to delivering just the right degree of snark using ~~sparkly tildes~~… Or you feel that slight sense of aggression when someone ends a simple text to you with a period.     In her new book Because Internet: Understanding the New Rules of Language, internet linguist Gretchen McCulloch explores some of the ways that online communication has changed the way we write informally, from the early days of computer bulletin boards to today’s Facebook and Twitter memes. Subscribe to this podcast. Follow our show on Instagram, TikTok, Facebook, and Bluesky @scifri and sign up for our newsletters. Got a science question that’s keeping you up at night? Call us: 877-472-4374 Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.