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  "path": "/articles/how-einsteins-lost-theory-could-help-us-find-minerals",
  "publishedAt": "2026-06-12T12:00:00.000Z",
  "site": "https://eos.org",
  "tags": [
    "News",
    "cool tools",
    "Earth science",
    "experiments",
    "geophysics",
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    "light",
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  "textContent": "A humble elevator shaft was recently used in a test of the constancy of the speed of light. Credit: Jason Wong/Flickr, CC BY-NC-ND 2.0",
  "title": "How Einstein’s Lost Theory Could Help Us Find Minerals"
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