Old Things Considered: La Brea, Megalodon, Dino Footprints, Surviving History. Aug 25, 2023, Part 2

08/25/23 • 47 min

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How Early Humans May Have Transformed L.A.’s Landscape Forever

Join us on a time traveling adventure, as we go back 15,000 years to visit what’s now southern California. During the last Ice Age, saber-toothed cats, wooly mammoths, and dire wolves prowled the landscape, until ... they didn’t. The end of the Ice Age coincided with the end of these species. And for decades, scientists have been trying to figure out a big question: Why did these animals go extinct?

A new study in the journal Science offers new clues and suggests that wildfires caused by humans might’ve been the nail in these critters’ coffins.

Guest host Flora Lichtman talks with paleoecologist Dr. Emily Lindsey and paleobotanist Dr. Regan Dunn, both curators at the La Brea Tar Pits and Museum in Los Angeles, California, about what we can learn from animals preserved in tar pits, how fire transformed the ecosystem, and why we have to look to the past for modern day conservation and land management.

How Scientifically Accurate Are The Sharks In ‘Meg 2: The Trench’?

“Meg 2: The Trench” is the sequel to the 2018 movie “The Meg,” in which a team of ocean scientists discover a megalodon, the largest shark that ever lived, thriving at the bottom of the Mariana Trench. Megalodon went extinct over 2.6 million years ago ... or so the movie’s characters thought.

When the team’s research sub gets damaged, a skilled rescue diver, played by Jason Statham, is brought in, who happened to have encountered the same megalodon years earlier. Over the course of the movie, the team discovers how this long-thought extinct apex predator survived, and what they can do to stop it before it wreaks havoc on the surface world.

“Meg 2: The Trench” largely follows in that movie’s footsteps, but this time, it features not just one, but multiple megalodons. Oh, and they’re even bigger this time.

Universe of Art host D. Peterschmidt chats with Dr. Sora Kim, an associate professor of paleoecology at University of California, Merced, about what science the movie got wrong (and right) and how these over-the-top blockbusters can inspire the scientists of the future.

Scientists Discover Dinosaur ‘Coliseum’ In Alaska’s Denali National Park

Researchers recently discovered a rocky outcrop at Denali National Park in Alaska covered in dinosaur tracks, which they dubbed the “Coliseum.” It’s the largest dinosaur track site ever found in Alaska.

The area has thousands of prints from generations of dinosaurs living about 70 million years ago, including: duck-billed dinosaurs, horned dinosaurs, raptors, tyrannosaurs.

Flora Lichtman talks with Dustin Stewart, former graduate student at the University of Alaska Fairbanks and paleontologist for the environmental consulting firm Stantec, based in Denver, Colorado, about this dino hotspot.

Your Guide To Conquering History’s Greatest Catastrophes

Guest host Flora Lichtman takes us back to some of the scariest, deadliest moments in history. Think along the lines of the eruption of Mount Vesuvius, the Ice Age, and the asteroid that wiped out the dinos. But we’re going to revisit them using what we know now—and science, of course—to figure out if and how we could survive those events.

The idea of using science and hindsight to survive history is the premise of a new book, How to Survive History: How to Outrun a Tyrannosaurus, Escape Pompeii, Get Off the Titanic, and Survive the Rest of History’s Deadliest Catastrophes by Cody Cassidy.

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How Early Humans May Have Transformed L.A.’s Landscape Forever

A new study in the journal Science offers new clues and suggests that wildfires caused by humans might’ve been the nail in these critters’ coffins.

How Scientifically Accurate Are The Sharks In ‘Meg 2: The Trench’?

“Meg 2: The Trench” largely follows in that movie’s footsteps, but this time, it features not just one, but multiple megalodons. Oh, and they’re even bigger this time.

Scientists Discover Dinosaur ‘Coliseum’ In Alaska’s Denali National Park

The area has thousands of prints from generations of dinosaurs living about 70 million years ago, including: duck-billed dinosaurs, horned dinosaurs, raptors, tyrannosaurs.

Your Guide To Conquering History’s Greatest Catastrophes

We have a new podcast! It’s called

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Sea Otters, Alaskan Minerals, Salmon Restoration. Aug 25, 2023, Part 1

Countries Seek To Return To The Moon

On Wednesday, the Indian space agency ISRO celebrated as its Chandrayaan-3 craft successfully made a soft landing at the lunar south pole. This is the first mission to explore the region around the moon’s southern pole, and a major success for ISRO. The mission plans to use a robotic rover to conduct a series of experiments over the course of about 2 weeks, largely centered around the availability of water and oxygen-containing materials.

Less than a week earlier, a Russian craft, Luna-25, crashed onto the moon. It would have been Russia’s first moon landing in 47 years. The cause of the crash is not yet known. Maggie Koerth, science journalist and editorial lead for CarbonPlan, joins guest host Flora Lichtman to talk about the two lunar missions and whether the flurry of activity signals a new space race.

They’ll also discuss other stories from the week in science, including a new analysis of the Y chromosome, work on the camouflage skin of the hogfish, and a setback in a mission to clear up space junk.

What’s The Human Cost Of Alaska’s Mineral Boom?

A dusting of snow clings to the highway as Barbara Schuhmann drives around a hairpin curve near her home in Fairbanks, Alaska. She slows for a patch of ice, explaining that the steep turn is just one of many concerns she has about a looming project that could radically transform Alaskan mining as the state begins looking beyond oil.

Roughly 250 miles to the southeast, plans are developing to dig an open-pit gold mine called Manh Choh, or “big lake” in Upper Tanana Athabascan. Kinross Alaska, the majority owner and operator, will haul the rock on the Alaska Highway and other roads to a processing mill just north of Fairbanks. The route follows the Tanana River across Alaska’s interior, where spruce-covered foothills knuckle below the stark peaks of the Alaska Range. Snowmelt feeds the creeks that form a mosaic of muskeg in nearby Tetlin National Wildlife Refuge, a migration corridor for hundreds of bird species.

To read the full article, visit sciencefriday.com.

Salmon Flourish After Mine Damage Restored In Alaska

On Friday, July 28, there were hundreds of juvenile salmon clustered in a pool, in clear water surrounded by a bank of fresh woody debris. Not 100 yards away, a spinning drum processed sediment to extract gold.

This land is managed by a mining company, but it’s also the site of a major stream restoration project. Thousands of salmon are returning to this stream in Hope, more than 100 years after aggressive gold mining affected the path of the river. The project to restore Resurrection Creek has brought together a coalition of stakeholders, including the present-day mining company that occupies the site.

The restoration of Resurrection Creek began in the early 2000s. The goal was to correct habitat damage caused by historic mining.

More than 100 years ago, heavy mining activity in the gold rush town affected the stream pattern, turning it from a meandering creek to a straight ditch. Jim Roberts is vice president of Hope Mining Company, and he said hydraulic mining in the early 1900s fundamentally changed the waterway.

To read the full article, visit sciencefriday.com.

All About Sea Otters

Last month, a rowdy sea otter was stealing surfboards...

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US Surgeon General On Mental Health, Tracking Tick Bites. Sept 1, 2023, Part 1

What To Expect From Hurricane Season

We’re approaching the peak of hurricane season, which is usually around mid-September. It’s that time of year when it feels like there’s a new storm every week, and we blow through the alphabet trying to name them. This week, Hurricane Idalia made landfall around Florida’s Big Bend as a Category 3 storm, which caused a few fatalities, left hundreds of thousands of people without power, and some without homes. So what do we know about Idalia, and what can we expect from the rest of the hurricane season?

Ira talks with Rachel Feltman, editor at large at Popular Science, about hurricane season and other science news of the week. They chat about what we’re learning from India’s lunar rover, a three-inch roundworm pulled out of someone’s brain, a new study about public health and air pollution, heavy metals in marijuana products, what an ancient Egyptian mummy smells like, and a turtle named Tally, who is far from home.

The Surgeon General Warns About An Epidemic Of Loneliness

The early days of the COVID-19 pandemic were lonely for many, upending their social lives. But loneliness pre-dates COVID, especially among young people. In a recent advisory, the United States surgeon general, Dr. Vivek Murthy warned that the negative health effects of loneliness and isolation are comparable to smoking daily. Despite being more technologically connected than ever before, the Surgeon General’s Office is also raising concerns about the harms of social media on youth mental health.

Ira sits down for a conversation with the United States surgeon general, Dr. Vivek Murthy, about the intersection of youth mental health, social media, and loneliness. Dr. Murthy outlines both public policy and community interventions that can help strengthen America’s emotional well being and social connections.

Keeping Tabs On Tick Bites

If you live in the Midwest or Northeast, you’re probably aware of an issue that’s gotten worse over the years: ticks, and the illnesses they can spread, including Lyme Disease and Alpha-gal syndrome.

Scientists are still trying to learn more about how and where ticks are spreading. That’s where The Tick App comes in. It’s a community science effort where you can log your tick encounter and help scientists learn more about tick-borne disease. Science Friday digital producer Emma Gometz sat down with Ira to talk about her recent article profiling the app, and the scientists behind forms of tick monitoring research.

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