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[The Science of Waxworms and Mammalian Digestion: From Plastic-Eating Larvae to Poop Physics]-[Bag O' Worms & The Velocity Of Poop]

Wow in the World · B1 · 2017-06-19

Preschool Enlightenment
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📋 Summary

Uncovering Nature's Hidden Wonders: Waxworms and Digestive Science

In this episode of Wow in the World, hosts Mindy and Guy Raz explore two fascinating scientific discoveries that bridge the gap between biological curiosities and potential real-world solutions. From the surprising ability of a caterpillar to digest synthetic materials to the physics behind mammalian waste, the show highlights how curiosity drives scientific progress.

The Plastic-Eating Waxworm: Nature’s Potential Recycler

The episode begins with Mindy introducing her pet "waxworm," Welda. While waxworms are typically known as the larvae of wax moths—creatures that undergo metamorphosis similar to how "caterpillars turn into butterflies"—they have recently become the subject of intense scientific scrutiny.

Guy Raz shares the story of scientist Frederica Bertocini, who discovered that waxworms accidentally trapped in a plastic grocery bag had eaten their way out, leaving the bag "full of holes." This serendipitous observation led to collaborations with researchers at the University of Cambridge, such as Paolo Bombelli and Christopher Howe. Their experiments revealed that the waxworm's belly contains a specific protein—an enzyme—capable of breaking down polyethylene, the material used in non-recyclable grocery bags.

Given that humans produce "8 million tons" of this plastic annually, the potential for this discovery is immense. The researchers hypothesize that the waxworm’s gut can convert stubborn plastic into ethylene glycol, a liquid that can be repurposed for polyester fabric or antifreeze. While the hosts emphasize that this theory is "still being tested" and has a long way to go before widespread application, it serves as a powerful example of how observing nature can lead to innovative solutions for global environmental challenges.

The Physics of Poop: Why Size and Speed Matter

The second half of the show shifts to a more unconventional, albeit scientific, topic: the mechanics of animal digestion. Guy Raz discusses an experiment conducted by researchers David Hu and Patricia Yang at the Georgia Institute of Technology. The duo studied the excretion patterns of 34 different mammals at the Atlanta Zoo, including elephants, lions, and gorillas.

Contrary to what one might expect, the primary goal wasn't just to observe waste, but to understand the biological factors influencing excretion. The study revealed that "bigger animals poop faster than smaller animals." For instance, an elephant may finish in about five seconds, whereas smaller mammals take significantly longer. The researchers discovered that this efficiency is linked to a "thicker layer of a slippery coating" in the digestive tracts of larger animals.

This research is not merely a novelty; it has practical implications for medicine. By understanding these biological processes, scientists hope to develop new treatments for individuals who suffer from chronic discomfort or pain during bowel movements. Interestingly, David Hu’s work on this subject even earned him an "Ig Nobel Prize," an award celebrating research that "makes people laugh" before it makes them think. This segment reinforces the show's theme that scientific curiosity knows no bounds and that even the most "stinky situations" can yield valuable insights into human health.

Conclusion

Through these stories, Wow in the World emphasizes that science is fundamentally about "curiosity and discovery." Whether it is a tiny larva capable of consuming plastic or a study on the speed of mammalian digestion, the show demonstrates that the natural world is full of mechanisms that, when studied, can lead to life-changing inventions. As the hosts conclude, even a simple observation—like noticing holes in a grocery bag or questioning why animals poop at different speeds—can be the starting point for fixing huge problems on our planet.

🎯Key Sentences

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what on earth are you doing
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I'm just whipping up a little breakfast
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haven't I introduced you yet?
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she can't get enough of them.
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Do I not look like I know what I'm doing?
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📝Key Phrases

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music to your ears
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whip up
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during the course of
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can't get enough of
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under the assumption that
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📖 Transcript

Grownups, Wondery Plus subscribers can listen to Wow in the World early and ad-free right now.
Join Wondery Plus in the Wondery app or Wondery Kids Plus on Apple Podcasts.
Hey, Wowzer fans, Mindy here.
And before we start the show, I got to let you know that this November, with a special new episode featuring our friends at Circle Round and Terrestrials on Radiolab for Kids,
And don't miss when Elmo from Sesame Street stops by Wow in the World to make us all belly laugh on November 24th.
Oh, but that's not all, Reg.

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