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Greg Sullivan

I am an author, father, husband, pilot, and general-purpose geek. I delight in technology, the arts, travel, and the idea that combined and leveraged correctly, they can save the world. I write the Daily GOOD newsletter, which is fantastic. You should subscribe!

  • history, dinosaurs, paleontology, early humans, petroglyphs, footsteps, spirituality
    Photo credit: Renan Rodrigues Chandu and Pedro Arcanjo José Feitosa, and the Casa Grande boys | Canva – An ancient petroglyph is opening up the possibility that early humans knew more about dinosaurs than we thought.
    Culture, Science

    Stunning 9,000-year-old rock carvings suggest ancient people may have studied dinosaur tracks

    Greg Sullivan

    4/15/2025
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