> ## Content Index
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# What’s Inside the Oldest Rocks in the World?
- URL: https://www.cascadepbs.org/show/its-okay-be-smart/episode/whats-inside-the-oldest-rocks-in-the-world-xup7mk/
- Published: 2025-04-07T14:30:51.000Z
- Updated: 2025-08-20T09:56:03.000Z
- Description: The oldest rocks on Earth are more than just ancient—they’re time machines!
- Author: Cascade PBS Staff
- Tags: Be Smart, Season 13, Episode 3, #ZZZ_Episode_2d5d22ea-caca-4ec2-ad16-04cbf5bc354c, #episode, #ZZZ_Show_dc38a6e9-266e-43c1-b647-45e7445fad27, #v1.16

The oldest rocks on Earth are more than just ancient—they’re time machines, holding clues to Earth’s missing history and revealing what happened in the unknown times after the Big Bang. We’ll work with our Adam and Joss from Howtown to learn more and visit our friends at The Smithsonian to examine some of these beyond-ancient rocks ourselves.