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Earth’s spookiest lake is in Siberia and dates back 25 million years
What’s the weirdest thing you learned this week? Well, whatever it is, we promise you’ll have an even weirder answer if you listen to Popular Science’s hit podcast. The Weirdest Thing I Learned This Week hits Spotify, YouTube, Apple, and everywhere else you listen to podcasts every-other Wednesday morning. It’s your new favorite source for the strangest science-adjacent facts, figures, and Wikipedia spirals the editors of Popular Science can muster. If you like the stories in this post, we guarantee you’ll love the show.
FACT: The weirdest lake on Earth? It just might be Lake Baikal.
Featuring Geo Rutherford
This week’s episode features special guest Geo Rutherford, who you almost certainly know (at least from the forehead-up) as the host of “Spooky Lake Month.” Geo is also the author of a new book about yet another subject in haunted hydrology: spooky rivers. But for her appearance on Weirdest Thing, Geo stuck with the classics and told us about her favorite spooky lake of all.
While Geo’s first lake love will always be Lake Superior, she says the body of water she keeps finding new weird facts about is Lake Baikal.
This Siberian body of water is the deepest lake in the world—just over a mile, to be precise—and it holds more liquid than all of the Great Lakes combined, or around 1/5th of the planet’s total unfrozen freshwater supply. It’s also the world’s most ancient lake, dating back some 25 million years or more.
Baikal has stuck around long after most lakes would fill in with sediment because the earth beneath it is slowly being pulled apart. That rift means it keeps getting deeper and deeper, which provides somewhere for all the sediment brought in by rivers to go.
Baikal isn’t just chillingly deep. It’s also home to a host of unique animals, including the world’s only exclusively freshwater seal and some shockingly large amphipods. And don’t forget the trains!
FACT: There’s a songbird that walks underwater
Featuring Liz Clayton Fuller
This week’s episode also featured friend-of-the-pod Liz Clayton Fuller, who came on to share another fascinating bird fact with us.
While most songbirds flit through the treetops, the American Dipper—one of just a handful of dipper species in the world—dives headlong into freezing glacial meltwater and walks along chilly creek beds on long, spindly toes.
There’s a lot of weird stuff going on with this chunky little bird: it’s got solid bones to help cut down on buoyancy, eye lenses designed to focus-up under water, and nose flaps that act like the dorky little nose clips a kid might wear in a pool.
Listen to this week’s episode to learn more about these bizarre birdies—including how they helped launch Liz’s bird-painting career.
FACT: These soiled underpants made it all the way from the lab to the runway
Most people think of dirt as being pretty…inert. But a single teaspoon of soil can hold more organisms than there are people on Earth, and that microbial abundance is incredibly important. When soil gets too degraded—which is an increasing problem as humans farm and otherwise develop more land—we can end up with situations like the Dust Bowl.
Researchers have previously used the teabag index (TBI) to help citizen scientists collect and share data on the health of their local soil. But a team at the University of Zurich wondered if they could come up with something a little more visually appealing, and they landed on (literally) soiled underwear.
While the idea of burying underpants to check soil health is (to my delight) nothing new, these researchers wanted to apply some scientific rigor to the process. About 1,000 Swiss volunteers were conscripted to bury identical sets of white briefs, plus tea bags, so the researchers could quantify their decomposition and see how an underwear index would measure up to the good-ol’-TBI. Sure enough, they showed that underpants work as well as teabags for tracking soil’s ability to decompose organic material.
The study won an Ig Nobel prize, but that’s not all: A Zurich-based designer also turned the dirty undies into a Rococo-inspired ball gown so heavy it needed custom panniers.
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