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[Time-Traveling to Ancient Greenland: Discovering the Secrets of Permafrost DNA]-[Greenland Beach Day]

Wow in the World · B1 · 2023-03-06

Preschool Enlightenment
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📋 Summary

Unlocking the Secrets of Ancient Greenland

In this episode of Wow in the World, hosts Mindy Thomas and Guy Raz embark on an unexpected scientific adventure to Greenland. The journey begins with Guy Raz’s quest to complete an online photo challenge by capturing an image of something "beautiful and majestic." While initially planning to photograph elephants at the zoo, he discovers the safari zone is closed, leading Mindy to suggest a much more ambitious destination: Greenland.

The Science of Permafrost and DNA

The core educational premise of the episode centers on the discovery of ancient DNA trapped within Greenland's permafrost. Mindy explains that permafrost is defined as "Earth that's been completely frozen for more than two years." Scientists recently extracted DNA samples from this frozen ground, revealing that approximately two million years ago, Greenland was not the barren, icy tundra seen today, but a thriving ecosystem.

Key takeaways regarding the DNA discovery include:

  • Biological Instruction Manuals: Mindy describes DNA as the "instruction manual that lives inside every living thing," which allows researchers to identify species long after they have gone extinct.
  • Unprecedented Age: The discovery is groundbreaking because it significantly predates the previous record holder for the oldest DNA sample—a mammoth bone approximately one million years old. This new finding from Greenland is "twice as old as the previous record holder."
  • Biodiversity Records: By analyzing the DNA, scientists identified 135 different species that once inhabited the region, including birch trees, caribou (reindeer), arctic hares, and the majestic mastodon.

Mastodons: The Relatives of the Elephant

To satisfy Guy Raz’s photo challenge, the team uses their "wow machine" to travel two million years into the past. Upon arrival, they find a lush, green landscape rather than the frozen desert of the present. Mindy clarifies that while there are no modern elephants in Greenland, the region was once home to mastodons.

Mindy describes the mastodon as a "very close relative of the African elephant" that is essentially identical in size but "a little hairier." This discovery allows Guy Raz to finally capture his majestic photo, successfully completing his challenge despite the comedic interruptions from his companion, Dennis.

Conclusion

This episode emphasizes how geological time can drastically alter the climate and biodiversity of a region. By studying the microscopic remnants left behind in permafrost, researchers can reconstruct ancient worlds, proving that even a frozen, desolate landscape can hold the secrets to a vibrant, prehistoric past. The episode concludes with a reminder of the power of scientific curiosity and the importance of preserving the natural world for future generations.

🎯Key Sentences

1
I think I know why you want to go to avian world.
2
What are you two doing at the zoo?
3
I've been putting it to use with this online photo challenge.
4
Well, let me show you what I've photographed so far.
5
I don't know how to break this to you, but...
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📝Key Phrases

1
music to your ears
2
get on with the show
3
put to use
4
break this to you
5
bursting with life
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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 gotta 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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